6.7.1.1: Provide Vehicle Guidance

This page shows the three processes that make up the Provide Vehicle Guidance facility within the Provide On-line Vehicle Guidance function. These processes determine the actual vehicle guidance method, and generate the route and guidance instructions.

The key points about the facility are as follows:
- Guidance type depends on driver's request and on the availability of in-vehicle equipment;
- Dynamic guidance requires a communications links to a central facility;
- If dynamic guidance fails then autonomous guidance is automatically provided until it is restored;
- Autonomous guidance may use link travel times provided centrally, at the driver's request.

There are three processes defined as Process Specifications (PSpecs) in this collection:

1) Determine In-vehicle Guidance Method (6.7.1.1.1)
2) Provide Dynamic In-vehicle Guidance (6.7.1.1.2)
3) Provide Autonomous In-vehicle Guidance (6.7.1.1.3)