At their Tokyo Metropolitan Expressway Public Corporation (referred to as "MEPC" in the following paragraphs), the authors are planning to adopt "Environmental road pricing" for improving environmental conditions along the expressway with flow free electronic toll collection (ETC) system for the first time in Japan. And the authors are now performing necessary technical study on introducing flexible and variable toll policy on their expressways. At present, their toll is fixed, dependent upon vehicle type and all vehicles entering their expressway are charged at the entering toll gate. The "Flexible and Variable toll policy" can be introduced as driven distance dependent toll, multi-road section driven discount toll, special route driven discount toll and etc. Because their MEPC expressway toll gates are built for vehicle dependent fixed toll and no additional exit toll gate space is variable, they need to adopt flow free ETC processing at exit access road section or at main expressway section to realize above mentioned new tolls. In this paper, multi lane flow free ETC system dedicated short range communications (DSRC) shadowing problems study result is reported and suggested resolving method is introduced on study models.
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