A blind spot in a vehicle or vehicle blind spot is an area around the vehicle that cannot be directly seen by the driver while at the controls, under existing circumstances.[1] In transport, driver visibility is the maximum distance at which the driver of a vehicle can see and identify prominent objects around the vehicle.[2] Visibility is primarily determined by weather conditions (see visibility) and by a vehicle's design.[3] The parts of a vehicle that influence visibility include the windshield, the dashboard and the pillars. Good driver visibility is essential to safe road traffic.