California Driver License (DMV) Written Test 2025 – 400 Free Practice Questions to Pass the Exam

The correct answer emphasizes the importance of safety and communication while driving. When a highway is divided into lanes for traffic, it is essential for a driver to signal their intentions before changing lanes. This not only alerts other drivers to the upcoming maneuver but also helps create a safer environment by ensuring that everyone on the road is aware of each other’s actions.

Changing lanes should be done only when it is safe, which involves checking mirrors, using turn signals, and ensuring there is sufficient space to merge without jeopardizing the safety of oneself or others. This practice helps prevent accidents and maintains smooth traffic flow, as it allows other road users to anticipate a driver’s movement.

The other options suggest unsafe driving behaviors, such as moving between lanes at high speeds or never changing lanes, which could hinder one's ability to navigate traffic effectively. Straddling lanes and blocking following traffic is also dangerous and could result in collisions, further demonstrating why signaling and ensuring safety in lane changes is the best practice on highways.