Zone-based proximity warning systems organize the detection around distance: the space around the truck is divided into zones, and each zone carries its own response. The outer zone warns, the inner zone escalates, and the innermost zone intervenes. The zoning is what makes the system useful instead of annoying, because it replaces the single always-on alarm with a graduated response that the floor can read, and it is the structure that keeps alarm fatigue at bay. This post covers how the danger zones work and how to configure them.
The zone structure
The standard structure has three zones around the truck. The detection zone, the outermost, is where the system first sees the pedestrian or the tag, and its response is the warning: the tone, the light, or the haptic that says someone is near. The caution zone, the middle ring, is where the warning escalates: the faster tone, the brighter light, and the operator’s attention is explicitly demanded. The danger zone, the innermost, is where the intervention lives: the speed reduction and the automatic stop. The three zones are the show-warn-intervene spectrum on this site, organized by distance.
How the zones are measured
The zones are measured by the detection technology. The tag-based systems measure the distance to the wearable directly, with the UWB precision for the tight zones. The radar measures the return strength and the range, and the camera and LiDAR measure the position in the field. The zone boundaries are set in the system configuration, in meters from the truck, and the settings depend on the truck’s speed and the stopping distance that this site’s speed post works through. The zone that is too small gives the operator no reaction time; the zone that is too large floods the floor with warnings.
The escalation logic
The escalation logic is the part that prevents fatigue. The responses escalate with the proximity and the speed: the faster the truck or the closer the pedestrian, the stronger the response. The logic also decays: the warning stops when the pedestrian leaves the zone, so the system is silent by default and speaks only when the distance closes. The graduated response teaches the floor the meaning of the signals, and the silence by default keeps the signals meaningful. The deployment considerations on this site cover the tuning.
The configuration
The configuration is the operation’s job, not the vendor’s default. Set the zones from the exposure score on this site: the zones around the dock and the intersection work, the high-speed routes get the wider warning zones, and the blind corners get the earlier escalation. Pilot the zones on the highest-exposure route, measure the false-alert ratio and the response time, and tune the boundaries until the warnings mean something. The configuration is reviewed with the quarterly exposure rescore, because the layout changes and the zones have to change with it.
The integration
The zone system integrates with the fleet stack: the zone events flow into the telematics log, the near-miss reporting captures the zone entries as precursors, and the monitoring review reads the alert health monthly. The zones also coordinate with the zone-based speed control, so the warning and the speed reduction run on the same map. The system comparison on this site places the zone systems within the defense in depth of the pedestrian safety program.
The measure
The zone map as a living document
The zone map is a living document, and the maintenance of the map is worth naming. The layout changes on this site, the new racking, the moved aisle, the new dock position, all move the exposure, and the map has to move with them. The quarterly rescore is the map review, and the near-miss log is the input that finds the gaps, the zone that produced the close calls, the corner that the mirror does not cover. The map changes are logged and the operators are briefed on the changes, because the zone that the operator does not know is the zone that is ignored. The review reads the map health, the false-alert ratio per zone, and the speed compliance per zone, and the numbers keep the map honest. The living map is the difference between the zone system that protects and the one that is out of date.
The zone system is measured the way every warning system on this site is measured: the response time between the zone entry and the behavior change, and the false-alert ratio, read monthly from the telematics log. A system whose warnings produce fast responses and rare false alerts is a system the floor trusts, and the trust is the mechanism that prevents the struck-by event. The danger zones are the geometry of prevention, and the configuration, the escalation, and the review are what make the geometry hold.
