What does a single dashed white line indicate?

A single dashed white line indicates that drivers are allowed to change lanes. This line serves as a visual cue that it is permissible to cross the line to enter an adjacent lane, provided that it is safe to do so. It warns drivers to be cautious and ensure that the way is clear before making any maneuvers.

In contrast, a solid white line would indicate that lane changes are strongly discouraged, while the other options do not accurately describe the function of a dashed white line. For example, a dashed line does not imply merging traffic, nor does it pertain to speed limits, which can be indicated by separate signage rather than road markings. Understanding this marking is essential for safe lane discipline and making informed driving decisions.