What behavior constitutes improper lane changing?

Improper lane changing is primarily characterized by a lack of necessary safety precautions that are essential for ensuring the safety of all road users. The behavior that constitutes improper lane changing involves not signaling your intent, failing to check mirrors, and neglecting to look over your shoulder to assess the traffic situation.

When a driver does not signal, there is no communication to other road users about the driver's intentions. This can lead to confusion and increase the risk of accidents, as other drivers may not anticipate the lane change. Additionally, failing to check mirrors and not looking over one's shoulder means that the driver is not aware of the surroundings, particularly of vehicles in blind spots. This lack of awareness can lead to collisions with vehicles that are already in the lane to which the driver intends to move.

In contrast, proper lane changes involve signaling to announce intentions, checking mirrors for visibility, and looking over the shoulder to ensure that the lane is clear, all contributing to safe driving practices. Maintaining speed while changing lanes is acceptable as long as the lane change is performed safely, making B the only option that reflects unsafe practices.