Final answer:
When backing up a vehicle, it's necessary to look over your right shoulder and check your surroundings, but tapping your horn is not always required and is situational. Preventative actions are critical to avoid car damage and ensure safety.
Step-by-step explanation:
Safely backing your vehicle requires several steps to ensure that you do not cause damage or get into an accident. While looking over your right shoulder as you back up and checking your vehicle's surroundings are necessary for safety, tapping your horn before you back up is not always required.
The use of the horn when backing up is typically situational and may not be helpful or could even cause a disturbance. In the context of collision theory, the actions you take to prevent your vehicle from causing damage are crucial.
It does not mention tapping the horn but does emphasize the need for awareness and precaution, similar to being vigilant about your environment, such as watching for pedestrians with strollers, monitoring cars at intersections, and being aware of animals suddenly entering the street.