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Longman Dictionary of Contemporary English
road sign
noun
EXAMPLES FROM CORPUS
▪ Fisher's study also suggested that recall was not a good measure of whether a road sign had been heeded.
▪ It didn't say Blackberry Hill anywhere, there was just an old-fashioned road sign saying Broughton Street was four miles away.
Wiktionary
road sign

n. A sign for the control of traffic or the information of drivers.