Pillar 5 — Freight Technology

Geofencing for Trucking: How It Works and What It's Good For

Dwell Editorial · Updated 2026-04-24
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Geofencing for Trucking: How It Works and What It’s Good For

A geofence is a virtual boundary around a physical location — a shipper facility, terminal, or delivery point — that triggers an event when a GPS-tracked vehicle enters or exits. In trucking, geofence entry/exit events produce hardware-timestamped arrival and departure records that are the foundation of defensible detention pay documentation, automated detention detection, and facility performance analytics.

How Geofencing Works

Every modern telematics or ELD system (Motive, Samsara, Geotab, and others) allows you to define custom geofences around specific addresses. You specify the center point and radius (typically 100–500 meters for a facility), and the system generates an event record every time a tracked vehicle crosses the boundary.

That event record includes:

The timestamp is the critical element. Because it’s generated by hardware when the event occurs — not entered by a person after the fact — it’s independently verifiable and not subject to the same challenges as driver-entered times.

What Carriers Use Geofencing For

Detention Pay Documentation (Highest Value)

Geofence entry and exit timestamps are the evidence that wins detention disputes. When your truck’s GPS shows it entered a facility geofence at 9:03 AM and exited at 2:47 PM, you have hardware-verified arrival and departure times.

Compare this to a driver writing times on the BOL: the driver-written record is easy for a broker to challenge. The geofence event record has no plausible challenge — it’s machine-generated at the moment of the event, geolocated to the facility address, and part of a continuous data stream.

This is the evidentiary standard accepted in TIA arbitration and FMCSA dispute processes. ATRI’s 2024 Detention Study found that fewer than 50% of detention invoices are paid — the carriers who collect consistently are the ones with hardware-verified timestamps.

Automated Detention Detection

With geofence alerts configured, your telematics platform can notify dispatch automatically when a truck has been inside a facility geofence beyond a threshold — say, 2 hours and 15 minutes for a 2-hour free time allowance.

This alert becomes your detention detection system. Instead of relying on drivers to call in and dispatchers to remember, the system flags the event automatically. This is the first step toward a detention workflow that doesn’t require human action to initiate.

Facility Arrival and Departure Confirmation

Beyond detention, geofence events provide automatic confirmation that a truck arrived at and departed from each stop. This confirmation is useful for:

Dwell Time Analytics

Aggregated across loads, geofence dwell time data reveals which facilities consistently hold trucks longest. A facility that averages 3.5 hours of dwell on a 2-hour free time allowance is generating 1.5 hours of detention on every load — whether or not your billing team catches it.

This data informs lane pricing, rate negotiation, and the decision to accept or decline loads to that facility.

Setting Up Geofences for Detention Documentation

Step 1: Identify Your High-Detention Facilities

Start with the facilities where your drivers report the most waiting time, or where your existing detention data shows high frequency. You don’t need to configure geofences for every facility you’ve ever visited — prioritize the ones that generate the most detention events.

Step 2: Create the Geofence in Your Telematics Platform

In Motive, Samsara, or Geotab:

  1. Navigate to the geofence or places management section
  2. Add the facility address
  3. Set a radius — 100–200 meters is usually sufficient for a single facility; larger for complex facilities with multiple entrances
  4. Name the geofence with the facility name and address for easy identification

Step 3: Configure Dwell Time Alerts

Set an alert to fire when a truck has been inside the geofence for longer than your free time allowance (e.g., 2 hours). Configure the alert to notify your dispatch or billing team.

Step 4: Use the Event Reports for Invoicing

After delivery, pull the geofence event report for that stop. The entry timestamp is your arrival time; the exit timestamp is your departure time. Attach the report to your detention invoice.

Geofence Accuracy Considerations

Radius Sizing

A geofence radius that’s too small may miss trucks that park outside the building but within the facility perimeter. A radius that’s too large may include adjacent properties or streets.

For most enclosed facilities, 100–200 meters is appropriate. For large distribution centers with expansive staging lots, 300–500 meters may be needed to capture trucks entering the facility property even before reaching the dock.

Signal Interference

GPS signals can be weaker in certain industrial environments (heavy metal structures, underground docks). In rare cases, there may be brief gaps in GPS coverage at a facility. ELD engine activity data can fill gaps in GPS coverage — another reason dual-source GPS + ELD evidence is more robust than GPS alone.

Geofencing and the Automated Detention Workflow

Geofencing is the detection layer. A complete detention automation workflow builds on it:

  1. Geofence event → detention detected (geofencing handles this)
  2. Evidence package assembled (GPS + ELD data)
  3. Amount calculated from rate confirmation terms
  4. Invoice populated and queued for review
  5. Submission tracked against claim window
  6. Payment followed up systematically

Steps 1 handles detection. Steps 2–6 require either manual process or dedicated software. Dwell connects to Motive’s geofence and GPS data to automate the full workflow.

Join the Dwell waitlist to see how this works with your fleet’s existing data.

Automate what you just read about.

Dwell connects to your Motive account, detects detention automatically, and builds the evidence package before a dispute happens. No new hardware. We make money only when you do.