Sometimes it is difficult to see what is behind your vehicle. Have a person stand in view of the driver's side mirror behind the vehicle. They can direct your backward motion and alert you to danger. Remember, if you can't see your spotter, don't move the vehicle. Know the size of your vehicle and its limitations.
Many vehicles are deceptive with regard to length or size.
Before operating a vehicle, walk around it and get a feel for its dimensions. Always look around the outside of the vehicle before backing up. Sometimes other vehicles and other obstacles block the views. Always check behind the vehicle before backing up. This is an important safety tip because children, pets, and small objects can remain unseen to the driver of a backing vehicle, and often the driver cannot see them go behind the vehicle.