What does a continuous white line indicate on the edge of a lane?

A continuous white line on the edge of a lane primarily serves to mark the boundary of that lane. It indicates that drivers should not cross this line, as doing so can lead to unsafe maneuvers. It is essential for maintaining lane discipline and ensuring that vehicles remain within their designated lanes, which enhances road safety for all users.

The presence of this line helps to clearly delineate the lanes of traffic and assists drivers in maintaining proper positioning on the roadway. This is particularly important in areas where lane boundaries need to be emphasized, such as curves, intersections, or where there might be a risk of vehicles inadvertently straying into adjacent lanes or onto the shoulder.

Other options may suggest additional meanings or scenarios associated with lane markings, but a continuous white line is specifically intended to provide a clear boundary for lane usage without suggesting further context beyond marking the edge of the lane.