How does it work? //

Under the IAP, participating heavy vehicles are monitored using telematics services with an in-vehicle unit (IVU). The IVU is supplied and operated by an IAP Service Provider – a company that may already provide telematics services to transport operators.

The IAP is capable of monitoring three parameters - route, time and speed.

This means that the IAP Service Provider is capable of determining whether the vehicle has:

• been somewhere other than the permitted route
• travelled on a permitted route but at a prohibited time
• exceeded the speed condition stipulated by the road authority

Monitoring of vehicle route compliance is required under all IAP Applications. Monitoring of other parameters is optional, depending on whether the road authority requires these parameters for the particular IAP Application.

Although a vehicle operating in the IAP is monitored continually, road authories are only interested in data that demonstrates the vehicle's non-compliance with its conditions of access.