MARKING Read the traffic markings, know what they mean, and obey them. Pavement markings  have the same force of law as signs or signals.  1. Pavement markings are used like roadway signs to warn, regulate, and inform traffic. a. Yellow markings, such as center lines, separate traffic flow going in opposite directions. b. White markings, such as lane lines, separate traffic going in the same direction. c. Dashed lines are permissive. d. Solid white lines are restrictive, and solid yellow lines are prohibitive. It is illegal to drive on the shoulder of roadways.