What Do Diagonal Lines on the Pavement Warn Drivers Of?

Diagonal lines on the pavement mark crosswalks and warn drivers of designated pedestrian crossing areas. Diagonal lines marking crosswalks often appear as bold, bright white lines spanning a road or an intersection. In addition to intersections, crosswalks are also used in places of high pedestrian concentration, such as loading docks or in other areas where pedestrians may not see a clear, safe crossing spot, say officials at the Federal Highway Administration, or FHA.

In places where pedestrian visibility might not be pronounced, highway engineers should also install signs warning drivers of pedestrians crossing, notes the FHA. Fluorescent yellow signs may accompany non-intersection crosswalks, as can stop signs and other roadway markings.