News and Resources

March 26, 2021

PURDUE UNIVERSITY releases study on impact of presence lighting & digital speed limit trailers in work zones

Purdue University, in partnership with Ver-Mac and the Indiana Department of Transportation, conducted a study on the effectiveness of using Presence Lights & Work Zone Digital Speed Limit Trailers to increase motorist awareness & overall work zone safety.

Digital Speed Limit Trailer and Presence lighting
Here are some encouraging key findings from the study that support the further development of presence lighting and speed limit trailers in night-time construction zones to reduce vehicle speed:

  • The results showed that median speeds decreased by up to 13 mph from 11 PM to 7 AM with the deployment of presence lighting and digital speed limit trailers, compared to without these devices deployed. These results are consistent with previous presence lighting studies that showed similar speed reductions of 4 to 7 mph.
  • Increased compliance with the 55-mph speed limit was observed when presence lighting and digital speed limit trailers were deployed.

Presence lighting is one of several work zone safety & mobility solutions developed by Ver-Mac to reduce speeds and make work zones more secure.

Here’s an infographic showing how our multi-layered system helps secure a work zone.

Work Zone Presence lighting

Read the complete Purdue University study here.

For more information about our Digital Speed Limit Trailer, click here

For more work zone safety & mobility solutions, take a look at our online catalog