ILM Homes, Inc
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Traffic Impact Study Proposed Residential Development Libertyville, Illinois Prepared For: ILM Homes, Inc. May 10, 2021 Table of Contents 1. Introduction ................................................................................................................................. 3 2. Existing Conditions ..................................................................................................................... 6 Site Location ............................................................................................................................... 6 Existing Roadway System Characteristics .................................................................................. 6 Existing Traffic Volumes ............................................................................................................ 8 Crash Data Analysis .................................................................................................................. 10 3. Traffic Characteristics of the Proposed Development ................................................................... 11 Proposed Site and Development Plan ....................................................................................... 11 Directional Distribution ............................................................................................................ 11 Development Traffic Generation .............................................................................................. 13 4. Projected Traffic Conditions ..................................................................................................... 14 Development Traffic Assignment ............................................................................................. 14 Background Traffic Conditions ................................................................................................ 14 Year 2027 Projected Traffic Volumes ...................................................................................... 14 5. Traffic Analysis and Recommendations ................................................................................... 18 Traffic Analyses ........................................................................................................................ 18 Discussion and Recommendations ........................................................................................... 21 6. Conclusion ................................................................................................................................ 24 Residential Development Libertyville, Illinois 1 List of Figures and Tables Figures Figure 1 – Site Location .................................................................................................................. 4 Figure 2 – Aerial View of Site ........................................................................................................ 5 Figure 3 – Existing Roadway Characteristics ................................................................................. 7 Figure 4 – Year 2021 Base Traffic Volumes .................................................................................. 9 Figure 5 – Directional Distribution ............................................................................................... 12 Figure 6 – Site Traffic Assignment ............................................................................................... 15 Figure 7 – Year 2027 No-Build Traffic Volumes ......................................................................... 16 Figure 8 – Year 2027 Total Projected Traffic Volumes ............................................................... 17 Tables Table 1 – IL Route 137 with IL Route 21 – Crash Summary ....................................................... 10 Table 2 – IL Route 21 with Adler Drive – Crash Summary ......................................................... 10 Table 3 – Estimated Site-Generated Traffic Volumes .................................................................. 13 Table 4 – Capacity Analysis Results – IL Route 137 with IL Route 21 – Signalized .................. 19 Table 5 – Capacity Analysis Results – Unsignalized – Existing Conditions ............................... 20 Table 6 – Capacity Analysis Results – Unsignalized – No-Build Conditions .............................. 20 Table 7 – Capacity Analysis Results – Unsignalized – Projected Conditions .............................. 20 Residential Development Libertyville, Illinois 2 1. Introduction This report summarizes the methodologies, results, and findings of a traffic impact study conducted by Kenig, Lindgren, O’Hara, Aboona, Inc. (KLOA, Inc.) for a proposed residential development in Libertyville, Illinois. The site, which is currently vacant, is located in the southwest quadrant of the intersection of IL Route 21 and IL Route 137. As proposed, the site will be developed with approximately 90 townhome units. Furthermore, as part of the proposed development, the existing parking lot serving Wildberry Café will be expanded to provide a total of approximately 164 parking spaces to accommodate the existing parking demand. Access to the development will be provided via a proposed circulation roadway that will extend from IL Route 137 to Adler Drive. The circulation roadway will have right- in/right-out access from IL Route 137 and will have full access from Adler Drive. This circulation roadway will provide access for the proposed development as well as the expanded parking lot serving Wildberry Café The purpose of this study was to examine background traffic conditions, assess the impact that the proposed development will have on traffic conditions in the area, and determine if any roadway or access improvements are necessary to accommodate the traffic generated by the proposed development. Figure 1 shows the location of the site in relation to the area roadway system. Figure 2 shows an aerial view of the site. The sections of this report present the following: • Existing roadway conditions • A description of the proposed development • Directional distribution of the development generated traffic • Vehicle trip generation for the development • Future traffic conditions including access to the development • Traffic analyses for the weekday morning and weekday evening peak hours • Recommendations with respect to adequacy of the site access and adjacent roadway system Traffic capacity analyses were conducted for the weekday morning and weekday evening peak hours for the following conditions: 1. Year 2021 Base Conditions – Analyze the capacity of the existing roadway system using existing peak hour traffic volumes in the surrounding area, adjusted to reflect Pre-COVID- 19 traffic conditions. 2. Year 2027 Background Conditions – Analyze the capacity of the future roadway system using the projected traffic volumes that include the Year 2021 base traffic volumes and the ambient traffic growth. 3. Year 2027 Projected Conditions – Analyze the capacity of the future roadway system using the projected traffic volumes that include the Year 2021 base traffic volumes, ambient traffic growth, and the traffic estimated to be generated by the full buildout of the proposed development. Residential Development Libertyville, Illinois 3 SITE Site Location Figure 1 Figure 1 – Site Location Residential Development Libertyville, Illinois 4 Aerial View of Site Location Figure 2 Figure 2 – Aerial View of Site Residential Development Libertyville, Illinois 5 2. Existing Conditions Existing traffic and roadway conditions were documented based on field visits and traffic counts conducted by KLOA, Inc. The following provides a detailed description of the physical characteristics of the roadways including geometry and traffic control, adjacent land uses and peak hour traffic flows along area roadways. Site Location The site, which is currently vacant, is located in the southwest quadrant of the intersection of IL Route 137 and IL Route 21 and is bordered by Ace Hardware Libertyville on the north, and single- family residential homes on the west and south. Land uses in the vicinity of the site are primarily commercial along IL Route 137 and IL Route 21 frontages and residential to the west and south. It should be noted that Adler Park School is located approximately 1,100 feet to the east of the site. Existing Roadway System Characteristics The characteristics of the existing roadways that surround the proposed development are illustrated in Figure 3 and described below. IL Route 137 (Peterson Road/Buckley Road) is an east-west other principal arterial roadway that in the vicinity of the site provides two travel lanes in each direction separated by a center two-way left-turn lane. At its signalized intersection with IL Route 21, IL Route 137 provides dual left-turn lanes, two through lanes, and an exclusive right-turn lane on the eastbound and westbound approaches. IL Route 137 is under the jurisdiction of the Illinois Department of Transportation (IDOT). East of IL Route 21, IL Route 137 carries an average annual daily traffic (AADT) volume of 24,700 vehicles (IDOT AADT 2019) and has a posted speed limit of 45 miles per hour. West of IL Route 21 carries an AADT of 30,200 vehicles (IDOT AADT 2019) and has a posted speed limit of 40 miles per hour. IL Route 21 (Milwaukee Avenue) is generally a north-south other principal arterial roadway that in the vicinity of the site provides two travel lanes in each direction. At its signalized intersection with IL Route 137, IL Route 21 provides dual left-turn