US road sign R5-1a · regulatory signs
WRONG WAY
California MUTCD, sign R5-1aWhat does the WRONG WAY sign mean?
You are going the wrong way. Stop, and turn around when it is safe.
How regulatory signs work
They give a rule you must obey. They are rectangular unless the manual names another shape (California MUTCD, section 2B.02); the STOP sign, for example, is an octagon (California Driver’s Handbook, “Laws and Rules of the Road”).
