| 摘要 |
A vehicle speed monitor for monitoring the speed of a moving vehicle is provided to the vehicle at an entrance to a road. The vehicle speed monitor records instantaneous accelerations of the vehicle along three axes over time. The vehicle speed monitor may be implemented as a contact or contactless integrated circuit (IC) card. The vehicle speed monitor is returned at an exit from the road, and scalar instantaneous speeds of the vehicle are determined from the recorded instantaneous accelerations in the vehicle speed monitor. The scalar instantaneous speeds are compared to one or more speed limits between the entrance and the exit to determine any speed limit violation. The vehicle speed monitor may also function as an electronic toll card where a toll is determined from the entrance and the exit. At the exit, the driver of the vehicle is charged with a fine and a toll, if any.
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