Ultra-wideband (UWB) typically measures the distance between a forklift and a tagged pedestrian to within tens of centimetres, more precisely than Bluetooth Low Energy or GPS, because it times very short radio pulses instead of estimating range from signal strength. Real-world accuracy depends on the site: steel racking, dense metal loads, a body blocking the tag, tag placement and installation quality all affect it. UWB also protects only people wearing a working tag. The reliable way to know its accuracy in a given building is to test it during a pilot against measured positions, in the aisles and doorways where trucks and people actually meet.
The full guide is Real-Time Location Systems (RTLS) for forklift safety, which explains how UWB ranging and positioning work. Measuring the distance between a truck and a tag needs no fixed infrastructure, while placing a person on a site map needs anchors installed around the building, and the accuracy of each differs. In a pilot, walk tagged staff to marked distances from a truck in open aisles, behind racking and at a cold-store door, and record when alerts fire. Check tag battery life, what the system does when a tag goes silent, and how tags reach visitors. Pair UWB with camera detection where untagged people are common.