The Village of Mount Prospect constructed a traffic calming project in the summer of 2026 on South William Street as directed by the Village Board at their October 28th, 2025 meeting. The traffic calming project included installing the following:
- Parking changes, pavement markings and marked crosswalks on William Street between Prospect Avenue and Shabonee Trail
- Speed feedback signs on the 600 and 700 blocks of William Street
- Raised median island at the existing crosswalk south of Weller Creek and intersection pavement markings at the intersection of William Street and Berkshire Lane
- “No Parking Here to Corner” signs at the intersection of William Street and Sunset Road
The Village is now conducting the post-study, collecting traffic counts and seeking resident input on the effectiveness of the traffic calming project. A survey has been sent out to residents on William Street, see RIB #7 in the documents section. Additionally, the Transportation Safety Commission will discuss the William Street Traffic Calming Project Post-Study at their October 12th, 2026 meeting at 7:00 PM at the Emergency Operations Center at Public Works, 1720 W. Central Road, Mount Prospect, IL 60056. The Public is invited to attend the meeting to learn about the post-study and provide comments on the traffic calming project. The post-study memo will be posted on this project website once finalized after the meeting.
Below provides background information on the William Street Traffic Calming Study.
Residents on the 600 – 700 blocks of South William Street submitted a petition requesting a traffic calming study be initiated at the end of September 2024. Their concerns included the number and speed of vehicles on the street.
Public Works staff reviewed the petition and then collected traffic counts. The traffic volume and speed data showed the street qualified for the Friendly Neighborhood Streets Program. Staff then sent out the initial public outreach to all residents in the project area to introduce the study and solicit input.
Surveys were sent to 78 residents; 25 surveys were returned (32%). Engineering Staff used comments received to help develop the preliminary preferred alternative to address traffic issues on the street. Please see the Alternative Analysis Memo in the Documents section to see the preliminary preferred alternative.
Staff presented the preliminary preferred alternative to residents at the March 10th Transportation Safety Commission Meeting see Transportation Safety Commission Minutes in the Documents section. Staff then installed temporary traffic calming measures to collect traffic counts to determine effectiveness of the trial and to solicit additional comments from the community. The trial showed a 70% reduction in vehicles going over 35 MPH on the street. See Second Public Outreach Comment Summary in the Documents section for all comments received on the initial design and during the trial.
Staff used the results of the trial and comments received to revise the design, see Revised Design Memo in the Documents section. Staff sent out the revised design and a ballot to all residents along William Street to voice their opinion on the revised design. The results of balloting and a recommended design were presented to the Transportation Safety Commission at their August meeting, see William Street August Transportation Safety Commission Minutes. After review, discussion and public comment, the Commission recommended the following improvements to the Village Board for consideration:
- Parking changes, pavement markings and marked crosswalks on William Street between Prospect Avenue and Shabonee Trail
- Speed feedback signs on the 600 and 700 blocks of William Street
- Raised median island at the existing crosswalk south of Weller Creek and intersection pavement markings at the intersection of William Street and Berkshire Lane
- “No Parking Here to Corner” signs at the intersection of William Street and Sunset Road
SeeWilliam Street Recommend Design for Village Board Consideration for the recommended improvement plan. These recommendations were presented to the Village Board at their October 28th meeting. At this meeting, the Village Board discussed the project and ultimately approved the project as recommended.
A recording of the Village Board Meeting can be found at the link below:
https://play.champds.com/mtprospectil/event/274
More information on traffic calming and the Friendly Neighborhood Streets Program can be found here:
https://www.mountprospect.org/departments/public-works/engineering/traffic/traffic-calming
The Village has sent a survey to all residents within the project limits requesting feedback on the traffic calming project. A copy of the survey is available under Rib #7 in the Documents section of this website.
Survey forms are due back to Public Works no later than October 16th, 2026 for inclusion in the post-study memo. Surveys can be mailed or delivered to Public Works, 1700 West Central Road, Mount Prospect, IL 60056, sent via email to publicworksdept@mountprospect.org, or over the phone at (847) 870-5640.
Please reach out to Public Works with any questions or comments by phone at (847) 870-5640 or by email at publicworksdept@mountprospect.org.
Luke Foresman, P.E.
Project Engineer
Village of Mount Prospect
Phone: 847-870-5640
Email: publicworksdept@mountprospect.org