What does encountering a 'keep left' sign limit for the driver?

The 'keep left' sign is a regulatory sign that instructs drivers to remain in the left lane of a roadway. Its primary purpose is to guide traffic flow and ensure safety by promoting the orderly movement of vehicles, particularly in areas where multiple lanes are present. When a driver encounters this sign, it signifies that they must use the left lane for travel, limiting their ability to use other lanes, which can help reduce confusion and prevent accidents.

While the sign does not dictate permissible speed limits or directly restrict actions such as making U-turns or turning right at intersections, it does clearly delineate the lane in which the driver must operate. Thus, the correct emphasis is on the specific lane restriction indicated by the 'keep left' sign, which directly affects where the driver can legally travel on the road.