Answer: stopsigns

AnswerCrossword Clue
STOPSIGNSRed alerts
STOPSIGNSRoadside octagons
STOPSIGNSCorner octagons
STOPSIGNSSpecial notices for motorists.
STOPSIGNSThese are usually octagonal
STOPSIGNSUrban halters