Which of the following is never allowed while driving on a highway?

Answer: B — Back up on the highway

Backing up on a highway is never allowed because it poses significant safety risks to you and other road users. Highways are designed for continuous, forward traffic flow, and reversing can lead to dangerous situations, such as collisions with faster-moving vehicles. When a driver must reverse, it can create confusion and increase the likelihood of accidents, given that other motorists may not expect or be prepared for such an action. In contrast, driving on the right side is a fundamental rule of the road, as is adhering to posted speed limits and using turn signals to communicate lane changes or turns. These actions are essential for maintaining traffic flow and ensuring safety for all drivers.