Electronic toll collection system

A roadside antenna 23 is installed in one lane of a tollgate structure 22. Multi-path is invalidated by radiating a multi-path interference radio wave from a multi-path interference wave radiation apparatus 35 linked to antenna 34. A roadside wireless control apparatus 24 communicates with the roadside antenna 23 and also controls the wave radiation apparatus 35 and lane control apparatus 25. The control apparatus 24 performs wireless communication with a vehicle unit 33 via the antenna 23 in response to instructions from the lane control apparatus 25. The antenna 34 is independent of the roadside antenna and is disposed in a lane adjacent to it. The interference radio wave from antenna 34 is radiated to cover the area of the adjacent lane. The wireless control apparatus 24 causes the interference radio wave from the interference wave radiation antenna simultaneously with the wireless communication.