What does a white edge line indicate on the roadway?

The white edge line is a critical component of roadway markings. It serves to delineate the boundary of the travel lane and the shoulder of the road. This is particularly important for driver safety, as it helps to ensure that vehicles remain within the designated travel area while avoiding hazards that may exist on the shoulder. By visually distinguishing the edge of the roadway, the white edge line provides guidance to drivers, especially in low visibility conditions.

In contrast, the other options pertain to different traffic markings or functions. For instance, while there are markings that indicate parking lanes, these are typically represented through different patterns or symbols rather than by solid white edge lines. Similarly, exit markings usually involve a combination of arrows and specific signage. Speed limits, on the other hand, are communicated through posted signs rather than through roadway markings. Thus, the white edge line’s primary role is to clearly mark the transition from traffic lanes to the shoulder, enhancing overall roadway safety.