Answer: roadsign

AnswerCrossword Clue
ROADSIGN

"Stop," for one

ROADSIGN

Speed limit posting, e.g.

ROADSIGN

Notice on the highway

ROADSIGN
MERGE or SIGNAL AHEAD, e.g.
ROADSIGN
Image to identify on a driver's license exam
ROADSIGNArrow, for one.
ROADSIGNLost motorist's aid
ROADSIGNExit indicator, e.g.
ROADSIGNSomething to read while driving