What is a key safety measure when backing a vehicle?

Using all mirrors and moving dead slow is a key safety measure when backing a vehicle because it maximizes visibility and control. By utilizing all mirrors, the driver can gain a comprehensive view of their surroundings, which helps in identifying potential obstacles, pedestrians, or other vehicles that may be in their path. Moving slowly allows the driver more time to react to any sudden changes or unexpected hazards that might appear.

In contrast, other methods such as relying solely on looking over the shoulder or not using mirrors can limit the driver’s awareness of their environment. Driving fast to reduce time is inherently dangerous, as it reduces the driver's ability to assess their surroundings effectively, leading to potential accidents. Therefore, using all mirrors in conjunction with slow movement is essential for safe vehicle operation while backing.