What is the meaning of solid white lines on the roadway?

• A. They indicate you should always stop at the line.
• B. They indicate separate lanes of opposite directions.
• C. They separate lanes moving in the same direction; do not cross except to turn into a driveway or to exit a highway.
• D. They indicate you cannot change lanes.

Answer: (C)

Solid white lines indicate lane boundaries for traffic moving in the same direction. They tell you to stay in your lane and not creep or weave into the adjacent lane. You may cross a solid white line only when turning into a driveway or private road, or when exiting a highway onto an off-ramp. Crossing them for the sake of passing isn’t allowed because it increases the risk of collisions with vehicles in the next lane. This helps keep traffic orderly and reduces surprises for other drivers.