What is the rule about solid white lines on roadways?

• A. They mark bus lanes.
• B. They require you to stop only if a sign indicates.
• C. They are painted in red to indicate no passing.
• D. They separate lanes moving in the same direction; do not cross except to turn into a driveway or to exit a highway.

Answer: (D)

Solid white lines between lanes moving in the same direction are all about lane discipline. They show the boundary you should not cross unless you’re making a permitted turn or exiting the roadway. Crossing these lines when you don’t need to can surprise other drivers and create a hazard, so stay in your lane and plan lane changes carefully.

The only times you may cross are when you’re turning into a driveway or entering or exiting a highway where the lane you’re in merges with an exit lane. In those cases, you cross the line to make the turn or to reach the exit, doing so with signaling and awareness of surrounding traffic.

Options about bus lanes, stopping requirements, or red markings describe different rules and markings, so they don’t apply to this situation.