An Evaluation of the Effectiveness of Digital Speed Limit Signs and Work Zone Presence Lighting on Speed Compliance During Lane Closure Operations

The NCDOT Work Zone Traffic Control Section is collecting speed data on 6 random Interstate/Freeway projects across the state that are using both Digital Speed Limit Signs and Work Zone Presence Lights during nightly lane closures. This interim report contains the collected speed data on two projects, measuring the influence on driver speeds with Digital Speed Limit Signs alone and when Work Zone Presence Lights are used in conjunction with the Digital Speed Limit Signs.