which line is used to mark the right edge of a road?

The line used to mark the right edge of a road is a solid white line. This solid white edge line defines the right edge of the travel lane for undivided roads, providing visual guidance to drivers to help prevent drifting off the road and to delineate the boundary between the roadway and the shoulder. Edge lines are usually solid white for the right edge, while the left edge lines are typically solid yellow on divided highways or one-way streets. These markings are a key safety feature required on many types of roads, including freeways, expressways, and rural arterials with sufficient width and traffic volume, as per standards like the MUTCD (Manual on Uniform Traffic Control Devices).