If you’re driving on a highway and the traffic suddenly slows or stops, and the vehicles behind you are at some distance:
1. Turn on your hazard lights.If someone coming up behind you is not paying full attention, your hazard lights might catch their eye and prompt them to slow down or stop in time. If not, the free space in front of your vehicle might lessen the severity of a collision.
2. Leave significant space between you and the vehicle in front of you.
3. Keep checking your rear-view mirror.
I called the Illinois State Police to ask what they thought about using hazard lights in this way. A desk sergeant said it was the right thing to do and added the second and third suggestions. Please, pass them on.
[What prompted me to think about these things? Driving on interstates through rain and fog and using hazard lights when traffic suddenly slowed and I was the last in line. I also left significant space and checked my mirror, but I do those things without thinking and would not have thought to recommend them.]