Special lights are sometimes used over each lane on highways and expressways. They are used most often to change the flow of traffic during certain hours of the day. Lanes may be used, but all other signs and signals must be obeyed. Pavement Markings Lines and symbols are used on a roadway to warn and direct drivers and to control traffic. Edge are solid lines along the side of the road that tell you where the edge of the pavement is.
Lane lines are white lines separating lanes of traffic moving in the same direction.
Crossing the line is allowed only when changing lanes or turning. Crossing a solid white line requires special care and is discouraged. Center lines are yellow lines separating lanes of traffic moving in opposite directions. Passing is allowed. Two solid lines mark the center of the roadway.