US road sign R15-1 · regulatory signs
Railroad crossing
California MUTCD, sign R15-1What does the Railroad crossing sign mean?
The railroad crossing itself. Yield to trains; stop when the lights flash or the gate is down (CVC 22451).
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”).
