Green Lights on Snowplows Improve Safety

New green flashing lights are being incorporated on winter maintenance vehicles in Michigan this winter. And while motorists are used to green meaning go - in this case, green means slow down.

In an effort to reduce crashes, the Michigan Department of Transportation (MDOT) and
several Michigan county road commissions and municipalities will be using green and amber lights that may be flashing, rotating or oscillating on 70 percent of their winter maintenance vehicles.


Studies suggest that humans can differentiate more shades of green than any other color. Better visibility with green lights means safer roads for winter maintenance workers and motorists. 

As the lights on trucks are replaced, the new green lenses are being incorporated. 

Wider use of the green lights is a result of legislation that amends the Michigan Vehicle Code to allow for the use of the color green on maintenance vehicles.

Additional information is also available on the When Green Means Slow Infographic