A Sacramento Bee reader had a similar thought, and asked our journalists whether motorists can turn left against a red arrow if there isn’t a sign around it that says “on left arrow only.” ...

Poor signage on new road Skip to ... If you are heading eastbound in the far left lane, about 1/4 mile from the Golden Sage intersection there is one left turn arrow painted on the road.

“When encountering a left turn arrow, it is to be treated as a red light.” The reason it’s an arrow is because it designates the direction you’re traveling, he added.