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Chicago Department of Transportation Traffic Signal Planning Audit

June 17, 2020

Summary

The Office of Inspector General (OIG) conducted an audit of the Chicago Department of Transportation’s (CDOT) traffic signal planning practices.

Executive Summary

Traffic signals are one of the most cost-effective tools for promoting traffic safety, reducing congestion, and minimizing air pollution. CDOT is responsible for managing 2,834 signalized intersections across Chicago.

The objective of the audit was to determine whether CDOT’s traffic signal planning meets industry best practices as defined by the Federal Highway Administration (FHWA). FHWA recommends that agencies have a documented traffic signal management plan with defined goals, objectives, and performance measures. The plan should also describe staff’s responsibilities and explain how they support the program’s goals and objectives. FHWA provides recommended staffing levels based on the number of traffic signals an agency manages.

Chicago Department of Transportation Traffic Signal Planning Audit - publication cover