What is the purpose of a double solid white line in lane marking?

The purpose of a double solid white line in lane marking is to separate traffic that is moving in the same direction while indicating that lane changes are not permitted. This kind of marking is often seen on busy roads or highways where it is crucial to maintain lane discipline and ensure safety. The double solid white line serves as a clear visual cue that drivers should remain in their lanes and not attempt to change lanes, helping to prevent potential collisions and maintain smooth traffic flow. This marking is particularly important in areas where lane changes could be hazardous due to traffic density or road conditions.