Washington State Department of Licensing Knowledge Test

If you see a solid white line between lanes of traffic, you must

1. Change lanes without hesitation

2. Stay in your lane

3. Speed up to overtake

4. Signal before changing lanes

The correct answer is: Stay in your lane

A solid white line between lanes of traffic indicates that lane changing is discouraged. This is often used in situations where lane changes could be hazardous, such as in high traffic areas or where the flow of traffic is tightly regulated. Staying in your lane promotes safety and helps maintain the structured flow of vehicles on the roadway. Other options imply maneuvers that either disregard the restrictions of the solid white line or make unsafe driving choices, which contradict what the traffic marking is communicating. By adhering to the solid white line signals, drivers contribute to reducing the risk of collisions and ensuring a smoother driving experience for everyone on the road.