Most new trucks and busses are now equipped with GPS units to monitor speed, length of stops, location etc. Large trucking companies can even monitor a trucks systems to pick up potential problems. On-Star can do a diagnostic on your car while you drive to work. The technology is there. The problem comes when you try to gain access to those monitoring systems. It could be called hacking. A way to do your part locally would be to take a picture of the truck/bus with the license plate or truck ID visible nd turn it over to the authorities. Just have someone else in the car with you do it or make sure you are stopped.