What color is used to mark the outer edge of a road?

The outer edge of a road is marked with white lines. This choice signifies the boundary of the roadway, providing a visual cue to drivers about where the road ends and often where the shoulder or unpaved area begins. The use of white lines helps enhance visibility, particularly at night or during adverse weather conditions, allowing drivers to maintain proper alignment and safety while navigating the road.

In contrast, other colors indicate different meanings. Yellow lines are typically used to separate traffic lanes moving in opposite directions, blue is often associated with parking spaces or signage for disabled drivers, and red can indicate no entry zones or specific hazards. Understanding these color-coded markings is crucial for safe driving and effective navigation on roadways.