What does a dashed white line signify on a multi-lane road?

A dashed white line on a multi-lane road indicates that traffic is moving in the same direction and that lane changes are permitted. This type of line allows drivers to merge or change lanes when it is safe to do so, signaling that vehicles can freely move between the lanes without crossing into oncoming traffic. It is a visual guide for maintaining orderly traffic flow in lanes that travel in the same direction.

In contrast, a solid white line would indicate that lane changes are discouraged or not permitted. Dashed lines are critical for facilitating safe movements in multi-lane road systems, as they help manage the flow of traffic and allow for efficient travel.