Centralized Traffic Management System

In January 2016, the City of Naperville begun implementation of a Centralized Traffic Management System (CTMS), a multi-phase initiative that will modernize the current traffic system to allow real-time, system-wide remote programming and operation of an unlimited number of traffic signals. 

Current Activity

June 1, 2017: PHASE TWO BEGINS. During installation of the adaptive traffic signal control equipment, intermittent lane closure at various intersections along Washington Street will be necessary. No full closures of intersections are anticipated, and motorists will be advised to use cation if they see workers in these areas. Work is expected to last two to three months, weather depending. 

Residents are encouraged to sign up for Naper Notify to receive notifications related to this project. 


The majority of the City's traffic signals were installed between 1980 and 2005. Naperville maintains 92 of 161 traffic signals located within the City's boundary with the remaining signals maintained by IDOT or DuPage County.

Prior to January 2016, the software running each of the City-maintained signals could only be remotely accessed using a dial-up phone connection within the City's Municipal Center. Although the system still performed essential tasks, it was becoming obsolete and could not accommodate newer functions allowed by the current generation of traffic signal management systems.

For years, the Citizen Survey results echoed previous results with a large percentage of residents concerned about traffic flow and congestion on area roadways. While the City has made numerous investments to increase roadway capacity wherever possible, further signal improvements are needed to maintain or improve current traffic levels of service, accommodate future growth in traffic volumes and increase public satisfaction.

In addition, DuPage County is leading a strategic framework for the development of Intelligent Transportation Systems in which traffic control and signal management systems were identified as priority projects for the area. The City of Naperville's modernization of its traffic signal system is consistent with this county-wide goal.

Project Timeline

Phase One - COMPLETE
During the first phase of the project, crews eliminated gaps in the traffic signal systems located along Washington Street by installing fiber optic cables to connect the three existing traffic signal systems that run along the entire length of Washington Street from Warrenville to Royce roads. As a result, City staff now receives automated notifications when traffic signals in this area malfunction, resulting in a quicker resolution to issues. A more consistent timing pattern for signals along this corridor is also in place. 

Phase Two - BEGINS JUNE 1, 2017
The second phase of the CTMS begins June 1, 2017 with the installation of necessary equipment at intersections along Washington Street. Once this equipment is installed, which should take approximately two to three months, traffic signals along Washington will be able to adjust in real-time based on immediate traffic demands. Signals that are preset to match best practices in traffic signal timing, with an additional flexibility to adjust based on current conditions, will help traffic in this heavily traveled corridor flow better during larger special events or other variable periods.  

Phase Three 
Future plans include additional phases to integrate other existing signal system corridors and county systems into the network. To obtain this goal, the City has applied with DuPage County for federal funding. These future phases are yet to be determined, and it will likely be 10-15 years before everything is connected.