Answer: roadsign

AnswerCrossword Clue
ROADSIGN"Stop," for one
ROADSIGNSpeed limit posting, e.g.
ROADSIGNNotice on the highway
ROADSIGNMERGE or SIGNAL AHEAD, e.g.
ROADSIGNImage to identify on a driver's license exam
ROADSIGNArrow, for one.
ROADSIGNLost motorist's aid
ROADSIGNExit indicator, e.g.
ROADSIGNSomething to read while driving