Signs tell you what you can or can't do, and what you must do.

Regulation Signs These signs give you information about rules for traffic direction, lane use, turning, speed, parking and other special situations. Some regulation signs have a red circle with a red slash over a symbol. These indicate you cannot do something; for ex - ample, no left turn, no right turn, or no U-turn.

Explanation:

There just there to keep everyone safe