the author of this app says:
The Traffilog application allows access to live information on an iPhone, iPad or iPod touch using the same login details as the web interface.
- View vehicles on a map or on satellite imagery
- View driver information for every allocated vehicle
- View vehicle speed, position, direction
- List all vehicles or vehicles by depot/contractor
- Replay journeys for every vehicle by date and time range
What's New in version 1.0.2
- Requires iOS 4.2 or later.