Indiana drivers may start noticing flashing green lights on highway workers as daylight hours get shorter.

The Indiana Department of Transportation is expanding Project Greenlight, a program that provides wearable green safety lights to highway crews to make them easier to see in low-light conditions.

According to an October 30 release, approximately 1,100 of the lights have been distributed to workers across Indiana since the program began as a pilot in fall 2025.

The Guardian Angel lights flash green and are visible from multiple directions. When worn alongside traditional high-visibility safety vests, they help distinguish workers from the white and amber lights commonly found in work zones.

INDOT says a study by Battelle Memorial Institute found the combination makes workers 89% more visible to drivers.

The lights are intended for overnight operations and other situations where visibility may be reduced, including fog, rain and snow. INDOT highway technicians and Hoosier Helpers are encouraged to use them.

“Crews are operating in darker conditions more often as we head into late fall and winter,” INDOT Commissioner Lyndsay Quist said.

INDOT is reminding drivers to slow down and remain alert in work zones, particularly when flashing green lights indicate workers are present.

Drivers can monitor road conditions, closures and traffic alerts through INDOT’s TrafficWise service at 511in.org⁠.