TRANSPORTATION ADVISORY BOARD AGENDA ITEM
ACTION REQUESTED:
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Approve a recommendation to approve the 2050 City of Naperville Road Improvement Plan
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DEPARTMENT: Transportation, Engineering and Development
SUBMITTED BY: Andrew Hynes, PE, PTOE, Deputy City Engineer/Engineering Manager
BACKGROUND:
The City of Naperville maintains approximately 475 centerline miles of streets, including numerous arterial and collector roadways. Traffic flow and congestion on major roads has been a long-standing concern identified through past Community Surveys. Minimizing congestion on arterial roads and intersections also reduces travel times, lowers emissions, and reduces unnecessary traffic on neighborhood streets.
Between 1988 and 2008, the City of Naperville assessed a road impact fee. Acknowledging that the new development results in additional traffic on the city streets and that capacity improvements were needed to accommodate the additional traffic; the purpose of the fee was to assess developers for the proportionate share of the costs of the improvement of the arterial road system.
A key component of the impact fee process was the development of the Road Improvement Plan. This plan consists of a list of numerous road corridors and intersection capacity improvements needed to meet minimum level of service requirements within a 20-year timeframe accounting for future development and traffic growth. A detailed traffic model was developed to identify capacity deficiencies and new improvements. The projects included in the approved Road Improvement Plan were added to the City’s Capital Improvement Plan budget with many implemented over the past 15 years.
Since the impact fee program was discontinued in 2008 and the associated model is approaching the end of its 20-year traffic projection, an updated high-level analysis of current and projected traffic conditions on Naperville’s road network is needed. The updated Road Improvement Plan will identify the location of road and intersection capacity issues and the modifications needed to reach acceptable levels of service (vehicle delay and flow). These improvements will be incorporated into the City’s Capital Improvement Program as new projects to be evaluated in further detail.
2050 Road Improvement Plan Update
In May 2024, the City hired Kimley Horn and Associates, Inc. to conduct a study to update the Road Improvement Plan. Over the past year, Kimley Horn worked with staff to collect traffic data, gather public input, and perform capacity analysis of intersections and corridors on the arterial road network. Key milestones in the process include:
• A public meeting was conducted on January 28, 2025, to gather public input on existing traffic conditions. Following the meeting, an interactive map was posted on the project webpage that allowed the public to post traffic concerns related to specific locations. The interactive map was available for 2+ weeks following the meeting.
• At the May 5, 2025, Transportation Advisory Board meeting (File No 25-0507), Kimley Horn presented a summary of the technical analysis and public comments.
• At the August 7, 2025, Transportation Advisory Board meeting (File No. 25-1009), Kimley Horn presented the proposed intersection and corridor improvements for anticipated 2050 traffic conditions.
DISCUSSION:
At the September TAB meeting, Kimley-Horn will provide a summary presentation on the proposed 2050 Road Improvement Plan update, implementation considerations, and next steps. A copy of the presentation slides and summary table of the proposed 2050 Road Improvement Plan locations are attached.
Following TAB and City Council review, the projects included in the 2050 Road Improvement Plan will be programmed in the Capital Improvement Program for implementation over the next 20 years.