TRANSPORTATION ADVISORY BOARD AGENDA ITEM
ACTION REQUESTED:
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Approve a Recommendation to Establish a 25 MPH Speed Limit for numerous subdivisions and streets across Naperville.
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DEPARTMENT: Transportation, Engineering and Development
SUBMITTED BY: Michael Prousa, TED Project Manager
BACKGROUND:
Several small subdivisions in Naperville have not had the neighborhood 25 mph speed limit established on their streets. These newer streets have been operating under the default 30 mph limit established by the Illinois Vehicle Code. Most of these streets were constructed in the mid 2010's or later.
DISCUSSION:
The Transportation, Engineering and Development Business Group (TED) investigated the need for neighborhood speed limits for these subdivisions and streets. Staff has received several recent requests for speed limit signage on the streets involved in this study.
The study warrants used to establish speed limits are located in Section B of the Illinois Department of Transportation (IDOT) "Policy on Establishing and Posting Speed Limits" and the Illinois Vehicle Code.
This IDOT Policy uses the 85th percentile speed (the speed at which 85 percent of the vehicles are driving at or below) and other adjustment factors for potential conflicts that includes the number of driveways, pedestrians, crashes, and on-street parking to determine the recommended posted speed limit.
With the list of streets without established speed limits numbering at 65, and most of these streets being cul-de-sacs, traffic data was collected at 6 different representative locations across the city. Maps of the streets with the proposed speed limits as well as the representative locations are attached. The study locations were chosen based on characteristics including length, number of driveways, and intersection streets. The 6 studies were done from September 11 - September 18, 2020 at Centennial Court, Paisley Lane, Shandrew Drive, Formby Road, Castle Lawn Court and Heatherfie...
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