What should a driver never do on a freeway?

A driver should never back up on a freeway because freeways are designed for high-speed travel and have specific traffic patterns that do not accommodate reversing vehicles. Backing up poses a significant danger not only to the driver of the vehicle attempting to reverse but also to other drivers on the freeway. In the fast-moving environment of a freeway, any unexpected maneuver such as backing up can lead to severe accidents, as surrounding vehicles may not have enough time to react appropriately.

Switching lanes without signaling, while dangerous and against traffic rules, may not always be directly life-threatening as long as it is done in a controlled manner and the driver is aware of surrounding traffic. Driving faster than the speed limit is also risky but can be monitored by law enforcement, and using emergency lanes is typically restricted to specific emergencies and requires careful judgment and adherence to traffic laws. Backing up, however, is inherently unsafe and should never be attempted on a freeway under any circumstances.