Readers ask about blank signs on the DMV ... as part of North Carolina general statute 20-158 says essentially that you must come to a stop at a red light, and another part "warns of a ...

Stop Here On Red signs are installed when a stop line in an intersection is not located where a motorist expects it to be, said NJDOT frequently answered questions on its website.

The idea of red meaning "stop" dates back to British railroad regulations of the 1840s—but for a while, a dearth of fade-proof red materials meant that many American stop signs were yellow instead.