What do edge line markings help drivers to do?

Edge line markings are a crucial feature of roadway design that serves a specific purpose in guiding driver behavior. By delineating the boundaries of the roadway, edge line markings help drivers maintain lane discipline. This means that they provide a visual cue to drivers, indicating the limits of the driving surface and assisting in preventing vehicles from unintentionally straying off the road.

In addition to promoting safety, edge lines improve the overall flow of traffic by clearly defining where drivers should position their vehicles, especially in conditions of limited visibility, such as during night-time or inclement weather. Proper lane discipline facilitated by these markings reduces the likelihood of accidents, making roadways safer for all users, including pedestrians and cyclists.

While other answer choices offer aspects related to roadway safety and navigation, they do not directly correlate with the primary function of edge line markings as effectively as maintaining lane discipline does.