Exit webhook detection. Track vehicles along approved corridors — get instant alerts when they deviate from the route.
Free tier: 1,000 location updates/day. For commercial fleet tracking, Growth plan covers 35,000/day.
Create corridor territories (buffered routes):
• Draw corridor: At fencemaker.app/dashboard/fences, trace the approved highway/route with buffer zones
• Import from routing: Export route from Google Maps/Mapbox as GeoJSON, buffer it (PostGIS ST_Buffer or turf.js), upload
• API creation: POST /api/v1/territories with GeoJSON for bulk setup
For high-value shipments, create one territory per route segment for granular tracking.
At fencemaker.app/dashboard/webhooks, add your endpoint.
Vehicle tracking app sends POST /api/v1/track updates every 30–60 seconds.
When vehicle exits the corridor territory, you receive an "exited" webhook immediately.
On "exited" event: log the violation, alert dispatch, notify customer, trigger re-routing.
Store territory_id → route_name mapping so you know which corridor was violated.
// Webhook receives "exited" event when truck leaves approved corridor:
// POST https://yourapi.com/webhooks/geofence
// {
// "event": "exited",
// "territory_id": "uuid",
// "territory_code": "CORRIDOR-1",
// "territory_name": "Highway 95 Corridor",
// "device_id": "truck_42",
// "timestamp": "2026-05-10T14:32:00Z",
// "lat": 12.9716, "lon": 77.5946
// }
app.post('/webhooks/geofence', async (req, res) => {
const { event, territory_id, territory_name, device_id, lat, lon, timestamp } = req.body;
if (event === 'exited') {
// Vehicle left approved corridor
const shipment = await findActiveShipment(device_id);
// Log the violation with location
await logEvent({
type: 'route_deviation',
shipment_id: shipment.id,
corridor: territory_id,
location: { lat, lon },
timestamp
});
// Alert dispatch immediately
await sendSlackAlert(
`🚨 Truck ${device_id} deviated from approved route (${territory_name})`
);
// Optional: trigger customer notification
if (shipment.high_value) {
await notifyCustomer(shipment.customer_id,
'Your shipment route has been updated'
);
}
}
res.sendStatus(200);
});Corridor territories need buffer zones — a vehicle on the exact route centerline will trigger false exits due to GPS drift (±5–15m accuracy). Buffer your corridors by at least 50–100 meters. For highways, 200m works well. Test with real vehicle data before deploying to production.