HomeMy WebLinkAbout8.1 Rand Road/IL 83/Kensington Road Intersections Phase 1 Study Status Update4/16/2020
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Dec 10, 2019 - SPECIAL MEETING OF THE MOUNT PROSPECT VILLAGE BOARD - 7:00 p.m.
8. VILLAGE MANAGER'S REPORT
8.1 Rand Road/IL 83/Kensington Road Intersections Phase 1 Study Status Update
Public
Discussion
At the April 17, 2018, Village Board meeting, a contract was awarded to Patrick Engineering, Inc. of Lisle, Illinois, to
conduct a Phase 1 engineering study for improvements to the closely spaced, high volume intersections at the
confluence of Rand Road, Illinois Route 83 (Elmhurst Road/Main Street), and Kensington Road.
For many years, these intersections have been problematic for motorists. Notably, the area has been plagued by
lengthy delays, long vehicle queues, blocked intersections, and vehicle crashes. The intersections are also infamously
difficult for pedestrians and bicyclists to traverse.
The roadways that comprise these intersections are controlled by the Illinois Department of Transportation (IDOT)
except for Kensington Road as it forms the west leg of the IL Route 83/Main Street and Kensington Road intersection.
This section of Kensington Road is owned and maintained by the Village of Mount Prospect (Note: Kensington Road
east of Main Street is an IDOT roadway).
Over the years, IDOT and Village staff, have attempted to mitigate these problems by modifying traffic signal timing
and limiting vehicle movements. Unfortunately, these conventional solutions have not proven effective.
For its part, IDOT recognizes the intersections are inefficient and spawn driver ire. However, the collective problems
have not spurned the agency to action. Presently, IDOT is faineant about these intersections and has no near term
plans to construct improvements.
To provide a catalyst for action, the Village has elected to complete a Phase 1 engineering study of the area. A Phase
1 study is a proven, formulaic engineering design process that involves inventorying existing conditions, soliciting
stakeholder input, developing and evaluating alternatives, and ultimately identifying a preferred solution.
The capstone deliverable of this study will be a Project Development Report (PDR). When complete, this report will be
submitted to IDOT for concurrence and approval. An IDOT sanctioned Phase 1 Study PDR will improve Village
(and IDOT) eligibility for federal funding to design and construct preferred improvements.
Staff is hopeful that a contemplative, innovative, and thorough PDR will yield State of Illinois or federal financial aid to
construct improvements. Recently, the Village completed a similar report for the Rand/Central/Mount Prospect Road
intersections and received over $5.5 million in federal and county aid to construct improvements.
Patrick Engineering has made substantial progress on many key components of the study including solicitation of
stakeholder input and development of alternative solutions. Attached is an Alternative Evaluation Report that details
work to date. In addition, it identifies and evaluates alternative solutions.
Also, attached is a PowerPoint presentation. This presentation summarizes work to date, encapsulates alternatives
analysis, and identifies staff's preferred solution.
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The next steps of this project will include finalizing stakeholder input, defining a preferred alternative(s), conducting a
second stakeholder open house, completing the PDR, and submitting final documents to IDOT. Staff expects that
Phase I of the project will be completed, including IDOT review, by the end of next summer (2020).
Patrick engineers and Village staff will make a short presentation of this information and facilitate discussion. Staff
seeks Village Board input regarding evaluation of alternative solutions and identification of a locally preferred solution.
Alternatives
1. Discussion of alternative solutions.
2. Action at discretion of Village Board.
Staff Recommendation
Staff recommends Alternative 1B referenced in the attached Alternative Evaluation Report.
Administrative Content
Executive Content
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■ Addition of Through Lanes
■ Addition of Turn Lanes
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✓ Saturday Midday = 9% Reduction
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ALTERNATIVES EVALUATION REPORT
RAND ROAD/IL 83/KENSINGTON ROAD INTERSECTIONS
VILLAGE OF MOUNT PROSPECT, ILLINOIS
Prepared For:
Contact: Mr. Matt Lawrie,, PE
Assistant Village Engineer
Village of Mount Prospect
(847) 870-5640
Prepared by:
Jeff L. Pisha, PE, PTOE
Senior Project Manager
Patrick Engineering Inc.
(630) 795-7469
May 15, 2019
Revised October 10, 2019
Revised November 4, 2019
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Executive Summary
The purpose of this Alternatives Evaluation Report (AER) is to provide an evaluation of the
alternatives considered for the proposed improvement of the Rand Road/IL 83/Kensington Road
intersections. Based on data collection, crash analysis, existing and projected year traffic
analyses, public feedback received from the Public Information Meeting held on December 3,
2018 and through the online questionnaire, a full range of alternatives was developed to address
identified transportation issues within the study area. The study area is shown in the figure below.
Building on the planning efforts summarized in the Rand Road Corridor Plan (RRCP), the Rand
Road/IL 83/Kensington Road intersections Phase I study takes a fresh look at the study area to
determine an improvement plan that addresses traffic deficiencies related to congestion, mobility,
access safety, and pedestrian/bicycle accommodations. The RRCP evaluated existing conditions
at this complex intersection and proposed several alternative improvement concepts. Alternatives
1) 5) 8, and 9 were presented in the RRCP. These alternatives involved closing specific legs or
connections at the intersection, realigning some legs, and the use of connector roadways to
accommodate certain traffic movements. Alternatives 1, 5) 8, and 9 create significant impacts to
the business and residential neighborhoods. The following is a list of these impacts:
• Access to Randhurst Village would be impacted.
• Existing businesses would be displaced with the installation of connector roadways.
• Commuters would have to travel longer distances to get to their destinations.
• Potential "cut -through" patterns could be created through parking lots and residential
neighborhoods.
Page 1 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Due to the impacts that Alternatives 1, 55 8, and 9 would have on area traffic and adjacent
properties, this Phase I Study did not examine any alternatives that closed entire legs of the
intersection. Rather, this study began the alternatives identification process at the point of only
restricting individual movements at the intersection to improve its overall traffic flow and
operations.
In total, twelve alternatives were examined as part of this study, which included the elimination of
certain turn lanes, the addition of through and turn lanes, a grade separation alternative, and the
use of a roundabout. The following alternatives were identified for a high-level evaluation:
• Alternative 1: Add left turn lanes on Kensington Road at its intersections with Rand Road
and IL 83. Extend the existing eastbound right -turn lane on Kensington Road at IL 83 to
Rand Road. Add a northbound right -turn lane on IL 83 and on Rand Road at their
respective intersections with Kensington Road. Add a dedicated southbound right -turn
lane on IL 83 at its intersection with Rand Road.
• Alternative 1A: Same improvements as described in Alternative 1 but also includes dual
northbound and southbound left turn lanes on IL 83 at Rand Road.
• Alternative 1 B: Same improvements as described in Alternative 1 A but also includes an
additional northwest -bound through lane on Rand Road at Kensington Road and IL 83.
• Alternative 2: Prohibit left turns from Kensington Road at its intersections with Rand Road
and IL 83. Extend the existing eastbound right -turn lane on Kensington Road to Rand
Road. Add a southbound right -turn lane on IL 83 at its intersection with Rand Road.
• Alternative 2A: Same improvements as described in Alternative 2 but with the addition of
a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road at
Kensington Road.
• Alternative 3: Same improvements as described in Alternative 2 but also prohibit left turns
from Rand Road.
• Alternative 3A: Same improvements as described in Alternative 3 but with the addition of
a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road at
Kensington Road.
• Alternative 4: Prohibit all left turn maneuvers at the three intersections. Extend the
existing eastbound right -turn lane on Kensington Road to Rand Road. Install a
southbound right -turn lane on IL 83 at its intersection with Rand Road.
• Alternative 4A: Same improvements as described in Alternative 4 but with the addition of
a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road at
Kensington Road.
• Alternative 5: Remove the left -turn lanes on Rand Road and Kensington Road at the
project intersections. Extend the existing eastbound right -turn lane on Kensington Road
to Rand Road. Install ring roads.
• Alternative 6: Grade separation.
• Alternative 7: Modern roundabout.
Concept drawings of Alternatives 1 through 6 are provided in Appendix 1.
Page 2 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Evaluation Approach
To evaluate each alternative, an alternatives evaluation table was developed and included in
Appendix 2 Alternatives were compared to baseline conditions (no -build with year 2040 traffic
volumes) using several evaluation criteria to demonstrate how well the project needs are met,
most notably:
• Remove blocked intersections: Reduce queuing through upstream signals and overall
queuing.
• Safety: Improve signalized intersections level -of -service (LOS) and reduce average delay
because reducing intersection queuing and congestion improves safety
• Impacts to area businesses and the community
• Planning level construction cost
Summary of Results
In comparison to the baseline condition (no -build with year 2040 traffic volumes), Alternatives 2,
2A) 3) 3A) 4) 4A) 5) 6, and 7 had the greatest impact to the adjacent businesses, residents and
right-of-way. On this basis, these alternatives are not recommended to be considered further
because they provide limited benefit when compared to their impacts.
Alternatives 1, 1 A, and 1 B remain under consideration and have been further evaluated. A more
detailed alternatives evaluation table was developed for these alternatives and is included in
Appendix 3.
Next Steps
Further coordination of Alternatives 1, 1 A, and 1 B with Village of Mount Prospect (Village) staff
and Village Board is planned. Based on the coordination, a recommended alternative will be
identified and will be presented at a second Public Information Meeting for all project stakeholders
to have the opportunity to review and comment on the overall alternatives evaluation process and
results. Subsequent to the Public Information Meeting #2, detailed engineering plans and studies
will be developed for the preferred alternative and will be coordinated with the Illinois Department
of Transportation (IDOT) and the Federal Highway Administration (FHWA) for review and
approval of the Phase I Study.
Page 3 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
I. INTRODUCTION
Previously, the Rand Road Corridor Plan (RRCP) was jointly funded and completed by the
Regional Transportation Authority (RTA) and the Village in early 2017 as a feasibility study of
general improvement needs and priorities along the Rand Road corridor from Camp McDonald
Road to Central Road. The RRCP provided a framework for near-term and long-term
improvement priorities, and identified the Rand Road/IL 83/Kensington Road intersections as a
near-term improvement priority.
Building on the planning efforts summarized in the RRCP, the Rand Road/IL 83/Kensington Road
intersections Phase I Study takes a fresh look at the study area to determine an improvement
plan that addresses traffic deficiencies related to congestion, mobility, safety, and
pedestrian/bicycle accommodations. Some of the reoccurring concerns heard are that long back-
ups at the intersections cause poor vehicular mobility. In addition, congestion causes erratic
driver behavior with associated safety concerns and pedestrian/bicycle accessibility concerns.
The purpose of this report is to provide an evaluation of the alternatives considered for the
proposed improvement of the Rand Road/IL 83/Kensington Road intersections. Based on data
collection, crash analysis, existing and projected year 2040 traffic analyses, public feedback
received from the Public Information Meeting held on December 3, 2018 and through the online
questionnaire, a full range of alternatives was developed to address identified transportation
issues within the study area.
The concept range of alternatives was formulated and discussed with Village staff. The range of
alternatives evaluated includes:
• Alternative 1: Add left turn lanes on Kensington Road at its intersections with Rand Road
and IL 83. Extend the existing eastbound right -turn lane on Kensington Road at IL 83 to
Rand Road. Add a northbound right -turn lane on IL 83 and on Rand Road at their
respective intersections with Kensington Road. Add a dedicated southbound right -turn
lane on IL 83 at its intersection with Rand Road.
• Alternative 1A: Same improvements as described in Alternative 1 but also includes dual
northbound and southbound left turn lanes on IL 83 at Rand Road.
• Alternative 1 B: Same improvements as described in Alternative 1 A but also includes an
additional northwest -bound through lane on Rand Road at Kensington Road and IL 83.
• Alternative 2: Prohibit left turns from Kensington Road at its intersections with Rand Road
and IL 83. Extend the existing eastbound right -turn lane on Kensington Road to Rand
Road. Add a southbound right -turn lane on IL 83 at its intersection with Rand Road.
• Alternative 2A: Same improvements as described in Alternative 2 but with the addition of
a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road at
Kensington Road.
• Alternative 3: Same improvements as described in Alternative 2 but also prohibit left turns
from Rand Road.
• Alternative 3A: Same improvements as described in Alternative 3 but with the addition of
a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road at
Kensington Road.
• Alternative 4: Prohibit all left turn maneuvers at the three intersections. Extend the
existing eastbound right -turn lane on Kensington Road to Rand Road. Install a
southbound right -turn lane on IL 83 at its intersection with Rand Road.
Page 4 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
• Alternative 4A: Same improvements as described in Alternative 4 but with the addition of
a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road at
Kensington Road.
• Alternative 5: Remove the left -turn lanes on Rand Road and Kensington Road at the
project intersections. Extend the existing eastbound right -turn lane on Kensington Road
to Rand Road. Install ring roads.
• Alternative 6: Grade separation.
• Alternative 7: Modern roundabout.
11. BASELINE CONDITION - NO -BUILD ALTERNATIVE
Considering design year 2040 peak hour traffic and existing intersection geometry, there is a
slight increase in delay and degradation in the LOS as compared to the existing conditions
capacity analyses due to the projected increases in traffic by the year 2040. Vehicles travelling
northbound on IL 83 at its intersection with Rand Road back up beyond the IL 83 and Kensington
Road intersection. Also, vehicles traveling southeast -bound on Rand Road at its intersection with
Kensington Road back up beyond IL 83 and Rand Road intersection. This situation causes
gridlock in the area. In addition, the turn lane queues are exceeding the amount of storage
provided. Therefore, the 2040 No -Build scenario does not address the project purpose and need.
111111. BUILD ALTERNATIVES DESCRIPTION AND ANALYSIS RESULTS
A description of each Build Alternative considered and a summary of the analysis results is
provided below. Concept drawings of Build Alternatives 1 through 6 are provided in Appendix 1.
The results of the evaluation are included in Appendix 2. For ease of reference, queue exhibits
showing resulting queue lengths directly follow each alternative in Appendix 1.
Alternative 1
Alternative 1 involves widening Kensington Road to the north to allow for installation of dedicated
eastbound and westbound left turn lanes on Kensington Road at its intersections with Rand Road
and IL 83. In addition, the existing eastbound right -turn lane on Kensington Road at IL 83 is
extended to Rand Road. Finally, a dedicated northbound right -turn lane is provided on IL 83 and
on Rand Road at their respective intersections with Kensington Road and a dedicated southbound
right -turn lane is provided on IL 83 at its intersection with Rand Road.
Summary:
There is slight improvement to the overall intersection delay at the subject intersections compared
to the No -Build Alternative. The overall intersection LOS during the morning peak hour at the
Rand Road/IL 83 intersection improved from an unacceptable LOS "E" to an acceptable LOS "D."
The westbound approach delay on Kensington Road at IL 83 however did not improve because
the westbound queue clears at the end of the signal cycle which prohibits vehicles to travel
through the Rand Road/Kensington Road intersection to use the protected westbound left -turn
phase at the IL 83/Kensington Road intersection. However, providing a dedicated left -turn lane
on Kensington Road results in the removal of the "oncoming traffic has longer green" situation
and by adding a left -turn protected phase should reduce the potential for accidents caused by
left -turning vehicles.
Page 5 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
The installation of a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road
at Kensington Road does not significantly improve delay or the LOS on those approaches
because the right -turn traffic volumes are relatively low, however, operations are improved. In
addition, the queues on those approaches generally remain the same as compared to the No -
Build Alternative. Vehicles travelling northbound on IL 83 at its intersection with Rand Road
continue to back up beyond the IL 83 and Kensington Road intersection. See Table 1 in Appendix
2 for results of the high-level analysis.
Advantages:
• The overall intersection LOS during the morning peak hour at the Rand Road/IL 83
intersection improved from an unacceptable LOS "E" to an acceptable LOS "D."
• Provides a dedicated left -turn lane on Kensington Road with a protected phase therefore
removing the need for the "oncoming traffic has longer green" situation.
• The left -turn protected phase on Kensington Road should reduce the potential for
accidents caused by left -turning vehicles.
Disadvantages:
• Additional right-of-way may be required on the north side of Kensington Road to widen
the roadway for the installation of the left -turn lanes.
• Additional right-of-way may be required on the south side of Kensington Road between
Rand Road and IL 83 to widen the roadway for an eastbound right -turn lane.
• Additional right -of way may be required on IL 83 to install the right -turn lanes.
• Additional right-of-way may be required on Rand Road, south of Kensington to install the
northbound right -turn lane.
• Vehicles travelling northbound on IL 83 at its intersection with Rand Road continue to back
up beyond the IL 83 and Kensington Road intersection.
• The difficulty of coordinating the traffic signals between each intersection to take
advantage of the left -turn protected phase causes an increase in delay.
Alternative 1 is carried forward for further evaluation and stakeholder coordination. See
Evaluation Table 2 in Appendix 3 for a more detailed review.
Alternative 1A
Alternative 1A involves the same improvements as described in Alternative 1 but also includes
the widening of IL 83 to install dual northbound and southbound left -turn lanes at Rand Road.
The addition of a second northbound and southbound left -turn lane was identified in the previous
IDOT Rand Road Strategic Regional Arterial (SRA) Study.
Summary:
In general, there is an increase in the overall intersection delay for all intersections with the
exception of the Rand Road and Kensington Road intersection compared to Alternative 1. The
overall intersection LOS during the evening peak hour at the Rand Road/Kensington Road
intersection improved from an unacceptable LOS "E" to an acceptable LOS "D", however, the
overall intersection delay at the IL 83/Rand Road intersection during the morning peak hour
remained at an unacceptable LOS "E". Due to the bottleneck issues on I L 83 south of Kensington
Road, vehicles are not able to maneuver into northbound lanes between Rand Road and
Kensington Road. In addition, the northbound left turn queue is spilling out of the left turn lane
blocking the northbound through lanes requiring the northbound dual left turn lanes to be
extended south of Kensington Road. Also, due to the addition of a second left -turn lane, the left
Page 6 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
turn phase has to be a "protected only" phase which results in "stealing" precious "green time
from other phases.
Similar to Alternative 1, the northbound approach at the IL 83/Rand Road intersection continues
to back up beyond the IL 83 and Kensington Road intersection. However, Alternative 1A creates
an additional situation; the southeast -bound approach at the Rand Road/Kensington Road
intersection now backs up through and beyond the IL 83/Rand Road intersection and the
westbound approach at the IL 83/Kensington Road intersection backs up through and beyond the
Rand Road/Kensington Road intersection. See Table 1 in Appendix 2 for results of the high-level
analysis.
Advantages:
• The overall intersection LOS during the evening peak hour at the Rand
Road/Kensington Road intersection improved from an unacceptable LOS "E" to an
acceptable LOS "D11.
• Provides a dedicated left -turn lane with a protected phase on Kensington Road,
therefore removing the need for the "oncoming traffic has longer green" situation.
• The left -turn protected phase on Kensington Road should reduce the potential for
accidents caused by left -turning vehicles.
Disadvantages:
• Additional right-of-way may be required on the north side of Kensington Road to widen
the roadway for installation of left -turn lanes.
• Additional right-of-way may be required on the south side of Kensington Road between
Rand Road and IL 83 to widen the roadway for an eastbound right -turn lane.
• Additional right-of-way may be required on IL 83 to install the right -turn lanes and the
additional left -turn lane.
• Additional right-of-way may be required on Rand Road, south of Kensington to install
the northbound right -turn lane.
• The storage length for the northbound left -turn lane needs to be extended to the south
through the IL 83/Kensington Road intersection.
• The northbound approach at the IL 83/Rand Road intersection continues to back up
beyond the IL 83 and Kensington Road intersection.
• The southeast -bound approach at the Rand Road/Kensington Road intersection backs
up through and beyond the IL 83/Rand Road intersection.
• The westbound approach at the IL 83/Kensington Road intersection backs up through
and beyond the Rand Road/Kensington Road intersection.
• The difficulty of coordinating the traffic signals between each intersection to take
advantage of the left -turn protected phase causes an increase in delay.
Alternative 1A is carried forward for further evaluation and stakeholder coordination.
See Evaluation Table 2 in Appendix 3 for a more detailed review.
Page 7 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Alternative 1B
Alternative 1 B involves the same improvements as described in Alternative 1 A but also includes
widening Rand Road to install an additional northwest -bound through lane at Kensington Road
and IL 83.
Summary:
With the addition of a northwest -bound through lane on Rand Road, there is an improvement to
the delay compared to Alternatives 1 and 1A. Overall, intersection LOS for the subject
intersections during the three peak hours (weekday AM and PM and Saturday mid-day) are now
operating at an acceptable LOS "D" and above. Similar to Alternative 1A, vehicles traveling
northbound, westbound, and southeast -bound continue to back up through and beyond the
adjacent intersections. However, queues are generally smaller for all approaches compared to
Alternatives 1 and 1A and are considerably smaller compared to the No -Build Alternative. See
Table 1 in Appendix 2 for results of the high-level analysis.
Advantages:
• Overall intersection LOS for the each intersection during the three peak hours
(weekday AM and PM and Saturday mid-day) are operating at an acceptable LOS "D11
and above.
• Provides a dedicated left -turn lane with a protected phase on Kensington Road,
therefore removing the need for the "oncoming traffic has longer green" situation.
• The left -turn protected phase on Kensington Road should reduce the potential for
accidents caused by left -turning vehicles.
• Improves delay and LOS along Kensington Road.
• Queues are reduced for all approaches.
Disadvantages:
• Additional right-of-way may be required on the north side of Kensington Road to widen
the roadway for installation of left -turn lanes.
• Additional right-of-way may be required on the south side of Kensington Road between
Rand Road and IL 83 to widen the roadway for an eastbound right -turn lane.
• Additional right-of-way may be required on IL 83 to install the right -turn lanes.
• Additional right-of-way may be required on Rand Road, south of Kensington to install
the northbound right -turn lane.
• Additional right-of-way may be required along Rand Road to accommodate the
additional through lane.
• The northbound approach at the IL 83/Rand Road intersection continues to back up
beyond the IL 83 and Kensington Road intersection.
• The southeast -bound approach at the Rand Road/Kensington Road intersection backs
up through and beyond the IL 83/Rand Road intersection.
• The westbound approach at the IL 83/Kensington Road intersection backs up through
and beyond the Rand Road/Kensington Road intersection.
• The difficulty of coordinating the traffic signals between each intersection to take
advantage of the left -turn protected phase.
Alternative 1B is carried forward for further evaluation and stakeholder coordination.
See Evaluation Table 2 in Appendix 3 for a more detailed review.
Page 8 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Alternative 2
Alternative 2 involves prohibiting left turns from Kensington Road at its intersections with Rand
Road and IL 83 and installing turnarounds (designated areas on the far side of an intersection,
where vehicles who desire to make aleft -turn can make a U-turn to go back to the intersection
and make aright -turn) downstream of the intersection. These turnarounds are designed to allow
traffic traveling in one direction on a road to efficiently make a U-turn without backing up or making
dangerous maneuvers in the middle of the traffic stream. Under this alternative, motorists traveling
on Kensington Road desiring to either turn -left onto Rand Road or onto IL 83 would travel through
the intersections and make a U-turn at the turnaround and then travel back to the intersection
where they now would make aright -turn. Alternative 2 also includes the extension of the existing
eastbound right -turn lane on Kensington Road to Rand Road and the installation of a dedicated
southbound right -turn lane on IL 83 at its intersection with Rand Road. Year 2040 peak hour
traffic volumes were redistributed due to the removal of the left -turn maneuvers from Kensington
Road.
Summary:
There is a slight improvement in the overall delays compared to the No -Build Alternative. The
overall intersection LOS during the evening peak hour at the Rand Road/Kensington Road
intersection improved from an unacceptable LOS "E" to an acceptable LOS "D", however, the
overall intersection delay at the IL 83/Rand Road intersection during the morning peak hour
remained at an unacceptable LOS "E". Vehicles traveling northbound and southeast -bound
continue to back up through and beyond the adjacent intersections. See Table 1 in Appendix 2
for results of the high-level analysis.
Advantages:
• Prohibiting left -turns from Kensington Road eliminates the "oncoming traffic has longer
green" situation.
• Prohibiting left -turns from Kensington Road reduces the potential for accidents caused
by left -turning vehicles.
• Prohibiting left -turns from Kensington Road eliminates the left turn phase, which
results in more green time for other movements.
• Improves delay and LOS along Kensington Road.
Disadvantages:
• Additional right-of-way will be required along Kensington Road to widen the roadway
for left -turn lanes at the turnarounds and for installation of the turnarounds.
• Reconfiguration of Home Depot's truck access will be required.
• Will impact the planned development along the south side of Kensington Road east of
Rand Road.
• Emergency access to Elmhurst Avenue is compromised.
• Increase in travel time for motorists desiring to make left -turns from Kensington Road.
• The northbound approach at the IL 83/Rand Road intersection continues to back up
beyond the IL 83 and Kensington Road intersection.
• The southeast -bound approach at the Rand Road/Kensington Road intersection backs
up through and beyond the IL 83/Rand Road intersection.
• Potential for an increase in motorists using residential streets or parking lots as a result
of eliminating left -turns from Kensington Road.
Page 9 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Alternative 2 is not recommended to be carried forward because of the significant impacts
to the adjacent businesses and residents.
Alternative 2A
Alternative 2A involves the same improvements as described in Alternative 2 but with the addition
of a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road at Kensington
Road.
Summary:
In general, there is not a significant improvement in the delay and LOS for the majority of the
approaches as compared to Alternative 2. Similar to Alternative 2, the overall intersection LOS
during the evening peak hour at the Rand Road/Kensington Road intersection improved from an
unacceptable LOS "E" to an acceptable LOS "D", while the overall intersection delay at the IL
83/Rand Road intersection during the morning peak hour remained at an unacceptable LOS "Ell.
The installation of a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road
at Kensington Road does not improve the delay or the LOS on those approaches because the
right -turn traffic volumes are relatively low. Vehicles traveling northbound and southeast -bound
continue to back up through and beyond the adjacent intersections. See Table 1 in Appendix 2
for results of the high-level analysis.
Advantages:
• Prohibiting left -turns from Kensington Road eliminates the "oncoming traffic has longer
green" situation.
• Prohibiting left -turns from Kensington Road reduces the potential of accidents caused
by left -turning vehicles.
• Prohibiting left -turns from Kensington Road eliminates the left -turn phase, which
results in more green time for other movements.
• Improves delay and LOS along Kensington Road.
Disadvantages:
• Additional right-of-way will be required along Kensington Road to widen the roadway
for left -turn lanes at the turnarounds and for installation of the turnarounds.
• Additional right-of-way may be required on the south side of Kensington Road between
Rand Road and IL 83 to widen the roadway for an eastbound right -turn lane.
• Additional right-of-way may be required on IL 83 to install the right -turn lanes.
• Additional right-of-way may be required on Rand Road, south of Kensington to install
the northbound right -turn lane.
• Reconfiguration of Home Depot's truck access will be required.
• Will impact the planned development along the south side of Kensington Road east of
Rand Road.
• Emergency access to Elmhurst Avenue is compromised.
• Increase in travel time for motorists desiring to make left -turns from Kensington Road.
• Potential for an increase in motorists using residential streets or parking lots as a result
of eliminating left -turns from Kensington Road.
• The northbound approach at the IL 83/Rand Road intersection continues to back up
beyond the IL 83 and Kensington Road intersection.
• The southeast -bound approach at the Rand Road/Kensington Road intersection backs
up through and beyond the IL 83/Rand Road intersection.
Page 10 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Alternative 2A is not recommended to be carried forward because of the significant
impacts to the adjacent businesses and residents.
Alternative 3
Alternative 3 involves the same improvements as described in Alternative 2 but also prohibits left
turns from Rand Road and includes the installation of turnarounds on Rand Road.
Summary:
In general, there is an improvement in overall delay and LOS compared to the No -Build Alternative
and a slight improvement in delay and LOS compared to Alternative 2. Overall intersection LOS
for the subject intersections during the three peak hours (weekday AM and PM and Saturday mid-
day) are now operating at an acceptable LOS "D" and above. Vehicles traveling northbound on
IL 83 at the IL 83/Rand Road intersection continue to back up beyond the IL 83 and Kensington
Road intersection. However, vehicles travelling southeast -bound on Rand Road at its intersection
with Kensington Road do not back up through the IL 83/Rand road intersection. See Table 1 in
Appendix 2 for results of the high-level analysis.
Advantages:
• Prohibiting left -turns from Rand Road and Kensington Road eliminates the "oncoming
traffic has longer green" situation.
• Prohibiting left -turns from Rand Road and Kensington Road reduces the potential for
accidents caused by left -turning vehicles.
• Prohibiting left -turns from Rand Road and Kensington Road eliminates the left -turn
phase, which results in more green time for other movements.
• Improves delay and LOS for all three intersections during the three peak hours.
Disadvantages:
• Additional right-of-way will be required along Rand Road and Kensington Road to
widen the roadway for left -turn lanes at the turnarounds and for installation of the
turnarounds.
• Reconfiguration of Home Depot's truck access will be required.
• Conflicts with the potential development within the vacant parcel located along the
east side of Rand Road north of Highland Avenue.
• Will impact the planned development along the south side of Kensington Road east of
Rand Road.
• Emergency access to Elmhurst Avenue is compromised.
• Increase in travel time for motorists desiring to make left -turns from Kensington Road
and Rand Road.
• Potential for an increase in motorists using residential streets or parking lots as a result
of eliminating left -turns from Kensington Road.
• The northbound approach at the IL 83/Rand Road intersection continues to back up
beyond the IL 83 and Kensington Road intersection.
Alternative 3 is not recommended to be carried forward because of the significant impacts
to the adjacent businesses and residents.
Page 11 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Alternative 3A
Alternative 3A involves the same improvements as described in Alternative 3 but with the addition
of a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road at Kensington
Road.
Summary:
In general, there a slight improvement in the delay and LOS compared to Alternative 3 for the
majority of the approaches. The installation of a northbound right -turn lane on IL 83 at Kensington
Road and on Rand Road at Kensington Road does not improve delay or the LOS on those
approaches because the right -turn traffic volumes are relatively low. Vehicles traveling
northbound on IL 83 at the IL 83/Rand Road intersection continue to back up beyond the IL 83
and Kensington Road intersection. See Table 1 in Appendix 2 for results of the high-level
analysis.
Advantages:
• Prohibiting left -turns from Rand Road and Kensington Road eliminates the "oncoming
traffic has longer green" situation.
• Prohibiting left -turns from Rand Road and Kensington Road reduces the potential for
accidents caused by left -turning vehicles.
• Prohibiting left -turns from Rand Road and Kensington Road eliminates the left -turn
phase, which results in more green time for other movements.
• Improves delay and LOS for all three intersections during the three peak hours.
Disadvantages:
• Additional right-of-way will be required along Rand Road and Kensington Road to
widen the roadway for left -turn lanes at the turnarounds and for installation of the
turnarounds.
• Additional right-of-way may be required on IL 83 to install the right -turn lanes.
• Additional right-of-way may be required on Rand Road, south of Kensington to install
the northbound right -turn lane.
• Reconfiguration of Home Depot's truck access will be required.
• Conflicts with the potential development within the vacant parcel located along the
east side of Rand Road north of Highland Street.
• Will impact the planned development along the south side of Kensington Road east of
Rand Road.
• Emergency access to Elmhurst Avenue is compromised.
• Increase in travel time for motorists desiring to make left -turns from Kensington Road
and Rand Road.
• Potential for an increase in motorists using residential streets or parking lots as a result
of eliminating left -turns from Kensington Road and Rand Road.
• The northbound approach at the IL 83/Rand Road intersection continues to back up
beyond the IL 83 and Kensington Road intersection.
Alternative 3A is not recommended to be carried forward because of the significant
impacts to the adjacent businesses and residents.
Page 12 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Alternative 4
Alternative 4 prohibits all left -turn maneuvers at the three intersections. Turnarounds are
proposed on all legs of the intersections except for south leg of the IL 83/Kensington Road
intersection. A turnaround is not proposed for the south leg of the IL 83/Kensington Road
intersection due to the numerous residential driveways located along this stretch of IL 83.
Motorists desiring to make a southbound left -turn from IL 83 onto Rand Road or Kensington Road
will utilize Highland Street to gain access to Rand Road or Kensington Road. Alternative 4 also
includes extension of the existing eastbound right -turn lane on Kensington Road to Rand Road
and installation of a dedicated southbound right -turn lane on IL 83 at its intersection with Rand
Road.
Summary:
In general, there is an improvement in the delay and LOS for the majority of the approaches
compared to the No -Build Alternative. In fact, all approaches are operating at an acceptable LOS
"C" or above. Vehicles are no longer backing up through and beyond the adjacent intersections.
See Table 1 in Appendix 2 for results of the high-level analysis.
Advantages:
• Prohibiting left -turns eliminates the "oncoming traffic has longer green" situation.
• Prohibiting left -turns reduces the potential for accidents caused by left -turning
vehicles.
• Prohibiting left -turns eliminates the left -turn phase, which results in more green time
for other movements.
• Improves delay and LOS along Kensington Road.
Disadvantages:
• Additional right-of-way will be required for installation of the turnarounds.
• Reconfiguration of Home Depot's truck access will be required.
• Conflicts with potential develop within the vacant parcel located along east side of
Rand Road north of Highland Street.
• Will impact the planned development along the south side of Kensington Road east of
Rand Road.
• Emergency access to Elmhurst Avenue is compromised.
• Increase in travel time for motorists deserving to make left -turns at the intersections.
• Potential for an increase in motorists using residential streets or parking lots as a result
of eliminating left -turns from Kensington Road, Rand Road, and IL 83.
• Forces vehicles desiring to make a left -turn from IL 83 to Kensington Road to make a
left -turn at its intersection with Highland Street. Installation of a left -turn lane on IL 83
at Highland Street would be required.
Alternative 4 is not recommended to be carried forward because of the significant impacts
to the adjacent businesses and residents.
Page 13 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Alternative 4A
Alternative 4A involves the same improvements as described in Alternative 4 but with the addition
of a northbound right -turn lane on IL 83 at Kensington Road and on Rand Road at Kensington
Road.
Summary:
In general, there is no noticeable improvements in the delay and LOS compared to Alternative 4
for the majority of the approaches. However, vehicles are no longer backing up through and
beyond the adjacent intersections. See Table 1 in Appendix 2 for results of the high-level analysis.
Advantages:
• Prohibiting left -turns eliminates the "oncoming traffic has longer green" situation.
• Prohibiting left -turns reduces the potential for accidents caused by left -turning
vehicles.
• Prohibiting left -turns eliminates the left turn phase, which results in more green time
for other movements.
• Improves delay and LOS along Rand Road, IL 83, and Kensington Road.
Disadvantages:
• Additional right-of-way will be required for installation of the turnarounds.
• Reconfiguration of Home Depot's truck access will be required.
• Conflicts with the potential development within the vacant parcel located along the
east side of Rand Road north of Highland Street.
• Will impact the planned development along the south side of Kensington Road east of
Rand Road.
• Emergency access to Elmhurst Avenue is compromised.
• Increase in travel time for motorists desiring to make left -turns at the intersections.
• Potential for an increase in motorists using residential streets or parking lots as a result
of eliminating left -turns from Kensington Road, Rand Road, and IL 83.
• Forces vehicles desiring to make a left -turn from IL 83 to Kensington Road to make a
left -turn at its intersection with Highland Street. Installation of a left -turn lane on IL 83
at Highland Street would be required.
Alternative 4A is not recommended to be carried forward because of the significant
impacts to the adjacent businesses and residents.
Alternative 5
Alternative 5 involves the removal of the left -turn lanes on Rand Road and Kensington Road at
the project intersections. The left -turn lanes along IL 83 at its intersections with Rand Road and
Kensington Road will remain. To accommodate the vehicles desiring to make left -turns from
Rand Road and Kensington Road, ring roads are proposed instead of turnarounds.
Summary:
There is a significant increase in delay and LOS for the IL 83/Rand Road and Rand
Road/Kensington Road intersections compared to the No -Build Alternative. In addition, extensive
right-of-way would be required to implement this Alternative. See Table 1 in Appendix 2 for results
of the high-level analysis.
Page 14 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Advantages:
• Prohibiting left -turns eliminates the "oncoming traffic has longer green" situation.
• Prohibiting left -turns reduces the potential for accidents caused by left -turning
vehicles.
• Prohibiting left -turns eliminates the left turn phase, which results in more green time
for other movements.
Disadvantages:
• Additional right-of-way will be required for installation of the ring roads.
• Additional traffic signals may be required at the ring road intersections.
• Installation of the ring road to the east will impact the planned development along the
south side of Kensington Road east of Rand Road.
• Residents located along Elmhurst Avenue may be opposed to the additional traffic.
• Increase in travel time for motorists deserving to make left -turns from Kensington Road
and Rand Road.
Alternative 5 is not recommended to be carried forward because of the significant impacts
to the adjacent businesses and residents.
Alternative 6
Alternative 6 is a roadway grade separation alternative. As part of this alternative, it was decided
to grade separate the roadway with the highest average daily traffic (ADT) to achieve the greatest
benefit. As such, this alternative involves the construction of a bridge that will carry Rand Road
over IL 83 and Kensington Road. All movements between IL 83 and Kensington Road would
remain, but there would be no connection at all between Rand Road and the other two roadways
of IL 83 and Kensington Road. Ring roads would be installed to accommodate vehicles traveling
to/from Rand Road to connect to the other two roadways.
Summary:
This alternative impacts access to the local businesses that utilize Rand Road for their access. It
also will require displacement of businesses in order to install the ring roads. However, installation
of the bridge will result in only one intersection with all movements operating at an acceptable
LOS "B". See Table 1 in Appendix 2 for results of the high-level analysis.
Advantages:
• The one remaining at -grade intersection at IL 83 and Kensington Road will operate
much more efficiently.
Disadvantages:
• Very high cost associated with the construction of the bridge to carry Rand Road over
the other two roadways.
• Access to the businesses along Rand Road will be severely impacted.
• Additional right-of-way will be required for installation of the ring road.
• Additional traffic signals may be required at the ring road intersections.
• Installation of the ring road to the east will impact the planned development along the
south side of Kensington Road east of Rand Road.
• Residents located along Elmhurst Avenue may be opposed to the additional traffic that
would be traveling on the ring road.
Page 15 of 16
Alternatives Evaluation Report
Rand Road/IL 83/Kensington Road Intersections
Village of Mount Prospect, Illinois
Alternative 6 is not recommended to be carried forward because of the significant impacts
to the adjacent businesses and residents and due to significant costs.
Alternative 7 (Not Illustrated)
Alternative 7 involves installation of a roundabout to accommodate all six legs of the intersection.
According to high level capacity analysis, three lanes or more would be required for the
approaches to the roundabout, which is impractical and not consistent with driver expectation in
the northeast Illinois region.
Alternative 7 is not recommended to be carried forward because three lanes within the
roundabout will be required, which is impractical and not consistent with driver
expectation in the northeast Illinois region.
IV. SUMMARY OF RESULTS
In comparison to the baseline condition (no -build with year 2040 traffic volumes), Alternatives 2,
2A) 3) 3A) 4) 4A) 5) 6, and 7 had the greatest impact to the adjacent businesses, residents and
right-of-way. On this basis, these alternatives are not recommended to be considered further
because they provide limited benefit when compared to their impacts.
Alternatives 1, 1 A, and 1 B remain under consideration and have been further evaluated. A more
detailed alternative evaluation table was developed for these alternatives and is included in
Appendix 3.
V. NEXT STEPS
Further coordination of Alternatives 1, 1A, and 1B with Village staff and the Village Board is
planned. Based on the coordination, a recommended alternative will be identified and will be
presented at a second Public Information Meeting for all project stakeholders to have opportunity
to review and comment on the overall alternatives evaluation process and results. Subsequent to
the Public Information Meeting #2, detailed engineering plans and studies will be developed for
the preferred alternative and will be coordinated with I DOT and the FHWA for review and approval
of the Phase I Study.
Page 16 of 16
Appendmix 1
0
Range of Alternatives Exh'IbI'ts
Appendix 2
High -Level
Evaluation Summary Table
Table 1- Alternatives Evaluation Summary
Comparison to Baseline - 2040 No -Build Alternative
Relatively Strong
Neural
Relatively Weak
IL Route 83 at Kensington Road
IL Route 83 at Rand Road
Rand Road at Kensington Road
Overall Intersection
Overall Intersection
Overall Intersection
Planning Level
Option
AM Peak Hour
PM Peak Hour
Sat Peak Hour
AM Peak
Hour
PM Peak Hour
Sat Peak Hour
AM Peak Hour
PM Peak Hour
Sat Peak Hour
Construction Cost
LOS
Delay
LOS Delay
LOS
Delay
LOS
Delay
LOS Delay
LOS
Delay
LOS
Delay
LOS Delay
LOS
Delay
Existing Conditions
D
38.3
D 42.2
D
35.7
E
57.3
D 43.3
D
41.6
C
29.3
E 66.8
D
49.4
2040 No -Build Alternative
D
39.4
D 43.7
D
36.8
E
60.5
D 47.5
D
43.1
C
29.6
E 71.1
D
52.2
Alternative 1
D
40.9
D 42.4
D
41.9
D 48.1
D
44.1
C
29.0
D
47.5
Alternative 1A
D
47.9
D 44.8
D
43.7
E
57.0
D 51.4
D
48.1
C
27.7
Alternative 1B
D
42.5
D 40.5
D
35.3
D
40.7
C
27.8
Alternative 2
D
40.0
D
35.5
D 53.0
D
43.6
C
24.7
Alternative 2A
D
37.4
D 48.7
D
44.2
C
25.1
Alternative 3
C
32.6
Alternative 3A
$6 - 7.5 M
Alternative 4
$7.5 - 9 M
Alternative 4A
$8 - 9;5 M
Alternative 5
D
40.4
D
37.1
E
67.4
D
48.5
$5.5 - 7 M
Alternative 6
-
-
- -
-
-
-
-
- -
-
-
Comparison to Baseline - 2040 No -Build Alternative
Relatively Strong
Neural
Relatively Weak
Append'ix 3
Evaluation Summary Table
Table 2 - Alternatives Evaluation Summary
Evaluation Criteria
Existing
Existing and Baseline Conditions
Conditions No Build Conditions
Overall Study Area
Avg Veh Entered
Delay (hours)[% decrease compared to 2040 No Build]
Travel Time (hours)[% decrease compared to 2040 No Build]
SpeedTotal
Avg
000000
Used (gal)
Penalty'Fuel
Overall Queuing
Arterials (Avg Travel Time - ..
Kensington Rd
WB Kensington Rd
c-
Signalized Intersections (Avg Delay - Seconds)
IL83 & Rand Rd
KensingtonEB
'•
,
Rd & Kensington Rd
ConstructionRand
Planning Level
aaaaaa
Notes:
Due to internal clearouts in the traffic signal sequence, it is unlikely that long queues will form inside the triangle.
1. Queuing penalty is the traffic volume in the lane times the percent of time during the simulation period that the lane is blocked.
Through lane back up preventing vehicles from accessing the turn bay is included in the queuing penalty.
Comparison to Baseline - 2040 No -Build Alternative
Relatively Strong
Neural
Relatively Weak
Alternatives
c-
,