Salvo Traffic Lights are a means of communicating the status of the loading bay door. The lights can be mounted inside, outside or on both sides of the loading bay. When mounted inside, a red light indicates that the bay door cannot be opened. A green light indicates that the door can be opened and loading or unloading commenced. When mounted outside, a red light indicates that the door is open the the vehicle must not drive away. A green light indicates that the door is closed and the vehicle can depart.