Patent ID: 7233260
Filing Date: 2007-06-19
Classification: G07B,G08G

Abstract:
1. A system for electronic toll collection in connection with a vehicle having a transponder, the vehicle travelling in a laneway, the system comprising: a vehicle sensor for detecting the vehicle in the laneway; a first antenna for transmitting a first signal to the transponder and for receiving a response signal from the transponder and being disposed above the laneway; a second antenna for transmitting a second signal to the transponder and for receiving the response signal from the transponder and being disposed at a side of the laneway; and a transaction processor coupled to said first antenna and to said second antenna for controlling generation of said first signal and said second signal and for processing said response signal received from said first antenna or from said second antenna, wherein said transaction processor is configured to generate said second signal in response to detection of the vehicle by the vehicle sensor only if no response signal is received by said first antenna in response to said first signal.