bus communication can be used to communicate between computer 12 and relay 34 this digital data interface could be implemented in any number of well know formats including pulse width modulation or serial data interface such as rs 232 j1587 j1939 etc when onboard computer 12 is commanded via control center 18 to disable vehicle 14 it applies a voltage to the relay by way of line 32 causing line 28 to be disconnected from line 24 and to be connected to line 30 as was mentioned above the voltage provided on line 30 is such that the engine control computer 26 understands that it is now being commanded to put the engine in an idle condition tracking vehicle 14 using periodic gps global positioning system by way of a wireless internet connection is possible by virtue of using well known global position sensor technology specifically an onboard global positioning system 21 can be used to receive gps signals and translate those signals into vehicle position information which is sent to control center 18 via wireless modem 16 it is contemplated that the control center can compare the received gps signals with preprogrammed route information if vehicle 14 deviates from.