When you’re driving and see flashing lights in your rearview mirror or on the side of the road, it’s important to understand ...

Luckily, road crews attacking Old ... vehicles were equipped with "additional green lights which are incorporated with existing flashing or revolving yellow (amber) lights," PennDOT said.

But what if your rearview mirror reveals green lights on a car behind you? They’re not as common as your typical emergency vehicle lights, but you could definitely see them on the road—and it ...