CITY COUNCIL AGENDA ITEM
ACTION REQUESTED:
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Waive the first reading and pass the ordinance to establish a 25 mph speed limit for several subdivisions and streets across Naperville (requires six positive votes)
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DEPARTMENT: Transportation, Engineering and Development
SUBMITTED BY: Michael Prousa, TED Project Manager
BOARD/COMMISSION REVIEW:
On October 1, 2020, the Transportation Advisory Board (TAB) recommended approval to establish a 25 mph speed limit at several subdivisions and streets across Naperville. (Approved 9-0)
BACKGROUND:
Several small subdivisions in Naperville have not had the neighborhood 25 mph speed limit established on their streets. Most of these streets, constructed in the mid 2010's or later, have been operating under the default 30 mph limit established by the Illinois Vehicle Code.
Staff from the Transportation, Engineering and Development Business Group (TED) has received several recent requests for speed limit signage and conducted a study to investigate the need for speed limits.
DISCUSSION:
The Study
The 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 such as the number of driveways, pedestrians, crashes, and on-street parking, to determine the recommended posted speed limit.
In total, 65 streets without established speed limits were included in the study. Most of the streets were cul-de-sacs so traffic data was collected at six different representative locations across the city. The study locations were chosen based on characteristics including length, number of driveways, and intersection streets.
The six studies were done from September 11 - September 18, 2020 at Centennial Court, Paisley Lane, S...
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