The law requires tow trucks to have warning light bars on the exterior and interior. These high-intensity amber- and white-flashing LED lights warn other motorists there is a tow truck at work. Whether it's helping police at a traffic stop or pulling a minivan out of a ditch, tow truck drivers must have lighting equipment to ensure drivers — especially those who aren't paying full attention — are aware of the tow truck's presence. These lights are especially critical at night or in inclement weather.