US road sign R5-1 · regulatory signs
DO NOT ENTER
California MUTCD, sign R5-1What does the DO NOT ENTER sign mean?
You may not drive into this road from here.
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”).
