What does a double solid white line indicate?

A double solid white line indicates that lane changes are prohibited. This type of marking is used to delineate lanes of traffic moving in the same direction where changing lanes could be dangerous or is not permitted. The solid lines signify a clear message to drivers: it is illegal to cross these lines to change lanes. This helps maintain safety and traffic flow by preventing drivers from making unexpected lane changes, which could lead to collisions or other hazards on the road. The use of double solid lines serves as an important visual cue for drivers to remain in their designated lane, ensuring a more organized and predictable traffic environment.