What does a double solid white line indicate?

A double solid white line indicates that there are separate lanes of traffic moving in the same direction, and crossing these lines is forbidden. This design is used to prevent lane changes in situations where it could be dangerous or where traffic is intended to stay in designated lanes for safety, such as in certain highway conditions or near intersections.

The presence of the double solid white line reinforces the idea that maintaining lane discipline is vital for traffic flow and for reducing potential collisions. It helps ensure that drivers remain in their lanes, especially in areas where visibility is limited or where other hazards are present. Therefore, vehicles must not move across these lines to maintain an orderly and safe driving environment.