Communication at the Loading Dock
The traditional vehicle restraint signaling system is a familiar fixture at plants and warehouses. The system uses green and red lights to signal the status of the vehicle restraint to the forklift operator and the driver of the semi trailer.
A green light inside tells the forklift operator it is safe to enter a trailer because the restraint is locked and the trailer is secured to the dock. When the inside light is green, the light on the exterior of the dock is red so that the truck driver knows not to pull away from the dock while the trailer is still being serviced. The lights are reversed when the restraint is unlocked and the truck driver knows it is safe to depart from the dock.