School bus drivers use mirrors mounted on the passenger (right) side looking across the front of the bus, this is to make sure there are no objects (children) immediately in front of the bus that are too short to be seen by the driver. Many delivery truck drivers have this same setup as well as US Mail delivery vehicles, some even have a similar setup to look across the back of the vehicle. Some folks have a loss of depth perception which makes them paranoid of getting too close and will stop mu