US road sign W4-1 · warning signs
Merge
California MUTCD, sign W4-1What does the Merge sign mean?
Traffic from the side joins your road ahead: be ready to let it in.
How warning signs work
They warn you of a hazard or a change in the road ahead, so you can slow down in time. Most are yellow diamonds with a black legend and border (California MUTCD, section 2C.02).
