A proximity warning system detects when a person, vehicle or object comes within a set distance of a forklift and alerts the driver, the pedestrian or both, without taking control of the truck.
Proximity warning is the simplest layer of forklift detection. Sensors such as ultra-wideband tags, radar, ultrasonic units or cameras watch a zone around the truck, and a light, buzzer, display or wearable vibration tells people to stop or look. The idea is borrowed in part from mining, where NIOSH has studied proximity detection on heavy equipment for years. Warnings work only if the person reacts in time, which is the line between a warning system and a collision avoidance system that slows or stops a compatible forklift.
Warning systems succeed or fail on alert quality. Too many false or irrelevant alerts and drivers stop reacting; zones too small and the warning comes too late at real travel speeds. Check which people and objects the system can detect, how zones are configured for each truck and area, and how alerts are delivered in a noisy building. OSHA 1910.178 does not require proximity warning systems. The proximity detection page covers the main technologies.