Lane/line markers Passing two directions Two-lane, two-way roadway: Passing is permitted when safe to do so. Do not try to pass on a hill or on a blind curve.
Passing prohibited Two-lane, two-way roadway: Passing is prohibited from both directions. Crossing the centerline is permitted only to turn into driveways, when permitted in your state.
Passing one direction Two-lane, two-way roadway: Passing prohibited when the solid yellow line is in your lane.
Undivided roadway Multilane, two-way roadway: Crossing the centerline is permitted only to turn into driveways.
Center two-way left turn lane Multilane, two-way roadway, with two-way left turn lane: This is reserved only for left-turning vehicles in either direction. Special signs and pavement marking arrows are used.
Restricted lane Multilane, two-way roadway, with special lanes assigned to buses and carpools. Diamond markings for high occupancy vehicles (HOV) and special signs are visible. The double white line indicates that changing lanes at this point is prohibited.