Outside of "Real Time" tracking this should work
http://roscovision.com/Categories-Products.aspx?Category=d7320eca-4eb4-4a2a-91fe-44232a043a61
More and more Limo Buses and even Stretches are getting these FREE from thier insurance companies.
Dual-Vision™ by Rosco is a self-contained, dual-camera, high-capacity audio/video digital recorder with GPS speed, location and GPS sensor data collection integrated into one unit with a security enclosure designed to prevent any tampering. An industry innovation, the palm-sized unit is secured to the windshield and provides a 130-142 degree clear view of both the exterior and interior of the vehicle.
•Data stored on removable SD card
•Video/audio can be replayed on any computer, no special de-coding subscription required
•Shut-down timer allows continued recording with the engine turned off
•Integrated GPS tracking
•Speed, direction, location, vehicle number and date/time stamp