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Logistics Automation

Forklifts Remain the Top Warehouse Hazard: Building RTLS and Proximity-Alert Collision Prevention

Strobes and rear cameras alone won't stop forklift-pedestrian collisions. This guide covers UWB RTLS, AI detection and blue spot lights, plus zone-based speed limits, near-miss analytics and WMS integration.

POLYGLOTSOFT Tech Team2026-10-257 min read0
Forklift SafetyRTLSCollision PreventionWarehouse SafetySerious Accidents

Why Forklift Accidents Keep Happening

Forklifts are almost always the first item on a warehouse safety audit. Multi-ton vehicles and people on foot share the same aisles, and that layout is the hazard.

The Recurring Pedestrian Collision Patterns

  • Blind spots: High loads block the driver's forward view, and pedestrians disappear between the mast and the racking
  • Reversing: Forklifts often travel in reverse while loaded, so drivers check behind them late
  • Intersections and rack ends: When a truck pulls out of a rack aisle into a main aisle, neither the driver nor the pedestrian can see the other coming
  • Why Beacons and Rear Cameras Aren't Enough

    Strobes and beepers run all the time, so workers quickly tune them out. A rear camera only helps when the driver is looking at the screen. Both depend on people staying alert every minute of a shift. What you need is an alert that fires only when there is real risk.

    Comparing the Technology Options

    | Approach | Positioning accuracy | Installation cost | Burden on workers |

    |----------|---------------------|-------------------|-------------------|

    | UWB tag-based RTLS | Roughly 10–30 cm | High (anchors required) | Workers wear tags |

    | Radar / AI camera detection | Several meters around the truck | Medium (per vehicle) | None |

    | Floor projection (blue spot) | No positioning | Low | None |

  • UWB RTLS tracks both vehicles and people, so it can drive zone control and analytics. The weak point: a tag left in a locker or with a dead battery is invisible
  • AI cameras and radar pick up visitors and contractors who have no tags, but racking and loads can block their view
  • Blue spot lights project a warning onto the floor in the direction a forklift is coming from. They are cheap and work especially well at intersections
  • In practice most sites combine approaches, for example RTLS plus blue spots at intersections.

    Zone-Based Speed Limits and Alert Design

    Speed Limits by Zone

    Once zones are defined in RTLS, they can be linked to the vehicle controller so speed is capped automatically. A typical setup might be 10 km/h in general aisles, 5 km/h at intersections and docks, and a stop alert when a truck enters a pedestrian-only zone. The actual figures should follow your site layout and internal safety rules.

    Avoiding Alarm Fatigue

    Set the alert radius too wide and the system fires hundreds of times a day, and workers start ignoring it again. To prevent that:

  • Use approach speed and direction as well as distance
  • Suppress alerts where the path is physically blocked, such as across a rack
  • Tier the response: first a vibration or chime, then a forced slowdown
  • Using Data to Find Risk Early

    Every proximity alert is a near-miss record. Plot them on a location heatmap and the hot spots show up.

  • By zone: If alerts cluster at one intersection, put mirrors, stop lines and blue spots there first
  • By time: Find the crowded periods, such as the morning inbound peak or the minutes after a shift change
  • Turn findings into fixes: Where picking routes overlap forklift lanes, separate the walkways or change the rack layout
  • If an intersection logs 40 alerts a week, for example, the same metric tells you whether the fix worked.

    Integrating with WMS and Access Control

  • Operator qualification: Let a forklift start only after a badge or tag confirms the operator is qualified (in Korea, a license for trucks of 3 tons or more, or completed operator training for smaller units)
  • Workforce allocation data: Use WMS task assignments to estimate how many people will be in each zone and adjust alert sensitivity
  • Legal evidence: Korea's Occupational Safety and Health Act requires records of industrial accidents to be kept for three years. A system log of near misses and corrective actions can also show that safety obligations under the Serious Accidents Punishment Act are being met
  • Rollout Path and POLYGLOTSOFT Support

    Rather than equipping the whole site at once, a realistic path is Phase 1: pilot in the highest-risk zones (4–8 weeks) → Phase 2: tune alert thresholds and measure results → Phase 3: expand site-wide and integrate with WMS.

    Drawing on its WMS and WCS experience, POLYGLOTSOFT designs the full stack: RTLS data collection, zone-based alert logic, near-miss heatmap dashboards, and integration with access and qualification systems. If you'd like to start by assessing the high-risk zones in your facility, get in touch with us.

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