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LaneWarden

Worker protection

Two layers around every crew

A predictive layer watches the approach and sounds the alarm before a vehicle reaches the work space. A boundary layer alerts the crew the moment a cone is struck. They run on separate hardware and separate networks, so neither waits for the other.
Replay an intrusionAbout Sentinel

The two layers

Layer 1 · Predictive

Sentinel watches the approach

Tracking radar and AI cameras follow every vehicle on the approach and predict where it will be. The alarm sounds before a vehicle reaches the taper, not when it hits it.

  • Taper crossing, intrusion trajectory or too fast to stop for the flagger
  • Siren of at least 110 dB at 50 ft and strobes at the trailer
  • SMS to the foreman and a video clip in Command
  • Runs on the trailer, without waiting for the network

Layer 2 · Boundary

Sensor cones mark the line

Cone-mounted impact sensors from a specialist supplier sit in the taper, buffer, work-space line and equipment gate. A struck or moved cone alerts the crew's wearables directly over the supplier's own local network.

  • Eight sensor cones and three wearables in every kit
  • Independent of the Sentinel, of cellular coverage and of Command
  • The contractor's competent person runs a function check at every shift start

One-direction kit

What sits where

Each kit protects one direction of one work area: four LaneWarden devices plus eight sensor cones and three crew wearables from a specialist supplier.

One kit covers one direction of one work area. Select a number, or an item in the list, to see what sits there and why.

No. 3 · 1 per kit

Sentinel

Shoulder at the taper or flagger station

Tracking radar and cameras face the approach. Siren and strobes when a vehicle is on course for the work space or cannot stop for the flagger.

About LaneWarden Sentinel

The alarm chain

What happens in the first seconds

The Sentinel's alarm runs on the trailer. Siren and strobes never wait for a cellular connection or a server; the record follows once the crew is warned.

  1. 0.0 s

    Step 1: Detect

    Tracking radar and cameras follow a vehicle that is not slowing for the flagger.

  2. ≤ 1 s

    Step 2: Alarm

    Siren of at least 110 dB at 50 ft and strobes at the trailer. The target is one second from detection.

  3. ≈ 1 s

    Step 3: Notify

    Text message to the foreman; the video clip is saved to Command with the radar track.

  4. If struck

    Step 4: Boundary

    A struck sensor cone alerts every crew wearable in range over its own network.

  5. After

    Step 5: Report

    An intrusion report with the track, alarm times and clip, for the agency and the contractor.

Time to conflict

How many seconds does the crew get?

Move the speed and see how much warning the alarm buys, and whether a driver reacting at the taper could still stop before the work space.
54mph
25 mph80 mph
Vehicle
Layout
Crew warning
13.3s
From radar pickup (460 ft out) to the work space, less the 1 s alarm target
Taper to work space
8.5s
Short 100-ft taper at the flagger plus a 570-ft buffer before the work space.
Stopping distance
478 ft
A driver reacting at the taper stops within the 670 ft before the work space.
Seconds of crew warning by approach speedCar (pickup at 460 ft)Truck (pickup at 590 ft)

Constant speed from radar pickup, 12-ft lane at a 60 mph design speed: taper and buffer from MUTCD Tables 6B-2 and 6B-3; stopping distance from the AASHTO formula with a 2.5 s reaction time and 11.2 ft/s² braking. Radar ranges and the 1 s alarm time are design values to be confirmed in testing. Your layout comes from the approved traffic control plan.

Plainly

What an alarm can and cannot do

Worker protection is a set of seconds, not a guarantee. We say what the design does and what is still to be proven.

  • No alarm stops a vehicle. It buys the crew seconds; the traffic control plan and positive protection still do the heavy lifting.

  • Alarm timing, detection ranges and the wearables' range over the sensor layout are design values until they are measured on a closed course.

  • Crew wearables respond to the sensor cones. Whether Sentinel alarms can also reach them depends on the supplier offering a trigger input, which is still being confirmed.

Guides

Go deeper

All guides

Next step

Protecting a crew on a two-lane highway?

We can walk your team through the kit layout for your traffic control plan, and what we would test on a closed course before the first shift.

Talk to usRun the live demo