To solve such traffic congestion without spending much cost that, since the temporary stoppage of vehicles at tollbooths in a freeway causes traffic congestion, countermeasures against the congestion are taken by increasing the number of the tollbooths which however, result in congestion after the passage of the tollbooths because many vehicles intend to return to their original lanes, and the congestion caused by depriving other vehicles of a small number of the lanes occurs at exits of rest stations, or areas near entrances from other roads, or even if the vehicles take methods of electronic toll collection (ETC), i.e. a method of paying a toll by radio.

A lane or a plurality of lanes in a zone including all of a congesting location and frontward and rearward areas where the congestion affects are separated from the other lanes, and automobiles traveling in the other lanes adjacent thereto are prevented from entering the separated lanes.