The newly developed free-flow electronic toll collection (ETC) system is a toll collection system aimed at solving such problems of city expressways as: (1) easing of traffic congestion at the center of the city, (2) improvement of environment along the expressways, (3) procurement of land (site) for new toll plaza and (4) diversification of toll system. The system has started joint operation as an ETC system for transit vehicles at Hanshin Expressway Public Corporation since July 2002, and is expected to be used successively as an ETC system for special zone toll collection by the end of fiscal year 2002, and as the ETC system for transit vehicles via ETC of Kobe Municipal Expressways Public Corporation. The system easily applicable to the road pricing system can be used as an unmanned system not only in city expressways, but also in other public corporations for roads and expressways.