What does a solid white line indicate?

• A. Stay in your lane; do not cross except to turn at intersections or into driveways when safe.
• B. You may pass slower vehicles in the same lane.
• C. You must stop at the line.
• D. You should speed up to clear the intersection.

Answer: (A)

A solid white line between lanes means you should stay in your current lane and not cross into the neighboring lane. Crossing is generally not allowed except when turning at an intersection or into a driveway, and only if it’s safe. This helps keep traffic orderly and reduces the chance of side-swipe crashes because drivers expect vehicles to remain in their lanes. The other ideas—passing in the same lane, stopping at the line, or speeding to clear an intersection—don’t reflect what a solid line signals about lane discipline. Stay in your lane and only cross to turn when it’s safe.