When is it safe to switch lanes?

Switching lanes safely is an essential skill for drivers to master, as it helps prevent accidents and ensures smoother traffic flow. The correct answer emphasizes the importance of checking both mirrors and blind spots before making a lane change. This practice is crucial because vehicles can be in your blind spots, which are areas around your car that you cannot see in your mirrors. Failing to check these areas can result in collision with another vehicle that you were unaware of.

Additionally, checking mirrors ensures that you are aware of all surrounding traffic, including vehicles that may be approaching rapidly from behind. This comprehensive check helps confirm that the lane is clear and safe for you to enter. Therefore, performing these checks is a fundamental safety measure that promotes defensive driving.

While other options contain elements that may seem plausible, they do not encompass the complete safety protocol required for changing lanes. For instance, switching lanes simply based on personal necessity without ensuring it’s safe can lead to dangerous situations.