Before backing up, you should _____.

Before backing up, it's essential to turn your head and look through the rear window. This action helps provide a clear view of the area behind your vehicle, allowing you to spot any pedestrians, obstacles, or other vehicles that may be in your path. While mirrors and rearview cameras can provide useful information, they may not capture all blind spots or the immediate area directly behind the car, which is crucial for safe maneuvering.

Checking mirrors or using technology like rearview cameras can supplement your view, but they should not be relied upon solely without turning your head. Also, signaling to other drivers can be a good practice in some situations, but it does not replace the fundamental necessity of ensuring that the area behind your vehicle is clear before you start backing up. Therefore, turning your head and looking through the rear window is the most effective way to ensure safety when reversing.