Traffic-actuated charging is a method of making drivers pay for the social costs, such as increased driving time, that they cause other drivers in congested traffic. Unlike other systems designed for the same purpose, it does not rely upon devices planted at many points in the street network. Instead, it consists of a device built into the car which computes a charge based on the speed and acceleration of the car. Ideally, such a system would levy a charge when the car is moving at a speed lower than the normal speed in uncongested traffic. It could also levy an extra charge for exceeding the speed limit, and have a special setting for times at which the car is parked. In this way, the cost of the device would be at least partially offset by the advantages of eliminating parking meters and increasing the capacity of the police to enforce speed limits. The normal speed in uncongested traffic is impossible to measure continuously, however, so a practical approximation is used instead - the charge increases with the amount of variation in the cars speed. The system consists of a generator and distance indicator attached to one wheel, a computer, and a signaling device to show that the device is running. It is designed so that there is no charge under uncongested conditions, even though the car must stop at stoplights and stopsigns. This method of charging was tested in Stockholm with positive results. During times of congestion the charge was much greater than at other times.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 739-743

Subject/Index Terms

Filing Info

  • Accession Number: 00072239
  • Record Type: Publication
  • Source Agency: Transportation Systems Center
  • Files: TRIS
  • Created Date: Jan 16 1977 12:00AM