What is the purpose of a solid white line between lanes of traffic moving in the same direction?

• A. To discourage lane changing
• B. To mark the edge of the road
• C. To indicate a pedestrian crossing
• D. To indicate a reserved lane

Answer: (A)

A solid white line between lanes moving in the same direction is there to keep drivers in their lanes and discourage lane changes. This boundary helps prevent weaving and conflicts as traffic flows, especially at higher speeds or in heavy traffic, making the ride safer and more predictable. You typically stay in your lane unless you need to exit, turn, or avoid a hazard and it’s legal to do so. It’s not marking the road edge, which sits at the outer boundary, nor is it a pedestrian crossing, which uses different markings. It also isn’t signaling a reserved lane, which is indicated by other signs and markings.