taillight
tail light
tail-light
tail lamp
taillamp
rear light

And refrain from following the tail lights in front of you.

I could barely see the tail lights on the traffic ahead of us.

Well what I saw was some tail lights going along the road.

But the man did not stop to watch its tail light disappear.

He could still see the tail light of the limousine.

You're not permitted to drive without a proper tail light.

If any cop was coming, he wouldn't see one more tail light among all the others.

Within a mile, he caught sight of the tail light up ahead.

At length they saw the tail light of an automobile.

He could see the tail light of the oil train stopped!