The single loading dock traffic light set mounts to the wall on the outside of the dock to give a visual signal to truck drivers of when to stay in place at the dock, and when it is safe to pull away. The polypropylene housing will not rust, pit, dent or corrode and is IP54 certified for indoor or outdoor use and come in either yellow or black. LED bulbs are used to reduce energy costs, require no maintenance and have a longer life span than incandescent bulbs. Light units come with a pre-installed toggle switch to switch between the red light, green light and power off functions as well as a flasher so that lights will blink on and off for greater visibility and to keep the bulbs from melting the lens.