Backup cameras and similar warning systems alert drivers if an object, person or animal is behind the car, with the goal of stopping the driver before he backs into or over it. These systems can be life-saving, such as by warning the driver before backing over a child playing in the driveway. Backup cameras are most common on SUVs and pickups because their higher ride height means they have larger rear blind spots. Still, all vehicles, including passenger cars, have some blind spots when in reverse, so backing into or over something or someone is a possibility in any car. They can also be very useful for warning of possible collisions with low objects, such as short fences, poles or any other potential metal-crunching items.