US road sign R3-5L · regulatory signs
LEFT ONLY
California MUTCD, sign R3-5LWhat does the LEFT ONLY sign mean?
Traffic in this lane must turn left.
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”).
