What should a driver do before backing up?

Before backing up, the correct course of action includes pushing the horn. This serves as an effective warning signal to alert others—pedestrians, cyclists, or other vehicles—of your intention to reverse. Sounding the horn can prevent accidents by ensuring that anyone nearby is aware that the vehicle is in motion and could pose a risk to their safety.

While activating hazard lights, reducing speed, and checking mirrors are all important aspects of safe driving, they do not specifically address the importance of warning others before you begin reversing. For example, hazard lights indicate a vehicle is stationary or experiencing an issue, which may not accurately convey the driver's intention to back up. Similarly, reducing speed is generally a good practice when maneuvering, but it does not provide notice to those around you. Checking mirrors is essential for ensure there are no obstacles behind the vehicle, but without sounding the horn, others may remain unaware of your actions. Thus, pushing the horn is a proactive measure that enhances safety when backing up.