Yellow lines are used to mark the center of two-lane roads, and to mark the left edge of divided highways, one-way streets, and ramps. Solid white lines divide lanes of traffic traveling in the same direction. Solid white lines are also used to mark the right edge of the road.

A solid yellow line indicates that passing is prohibited. A dashed yellow line indicates that passing is allowed. White lines separate lanes for which travel is in the same direction. A double white line indicates that lane changes are prohibited. A single white line indicates that lane changes are discouraged.

Areas of white diagonal stripes or chevrons painted on the road. These are to separate traffic lanes or to protect traffic turning right. If the area is bordered by a broken white line, you should not enter the area unless it is necessary and you can see that it is safe to do so.

IRC 35 is commonly used as the code for road markings, providing guidelines and standards for their implementation.