Signalbau Huber

URBAN TRAFFIC CONTROL & MANAGEMENT

Urban Traffic Control & Management > Public Transport Priority

Public Transport Priority

When approaching to a traffic light system, the position of the public transport vehicle is physically located by synchronization. Depending on local conditions 2 to 4 different radio data telegrams are transmitted to the traffic light system by the public transport vehicle:
  • advance notification telegram
  • ready-to-depart telegram
  • main notification telegram
  • departure notification telegram 
Infrared Beacon System
 
For positional synchronization an infrared road beacon is implemented in the approach area to the intersection. At the arrival of the public transport vehicle the signal points needed for the traffic light system request aretransmitted from the beacon to the vehicle. It is now able to send the corresponding radio data telegrams at the respective signal points to the traffic light system.

Vehicle-autonomous Procedure

All routes and signal points are stored in the vehicle’s on-board computer. The position of the vehicle is determined by means of the odometer reading and logical positional synchronization at the stops. The traffic light system requests are transmitted and stored by the vehicle’s on-board computer.

Differential Global Positioning System (D-GPS)

The vehicle is physically located by satellite-assisted positioning. When the vehicle arrives at the corresponding coordinates, the radio data telegrams required for traffic light system management are transmitted to the traffic controller. 

Dynamic Priority (Public Transport vehicles act as Floating Cars):
 
The given right of way vehicle determines dynamically its remaining travelling time up to the junction and takes its priorisation by radio communication with the traffic controller. 
 
 

© 2007 Signalbau Huber GmbH, Kelterstraße 67, D-72669 Unterensingen
Phone: +49 (0)7022/6025-200, Fax: +49 (0)7022/6025-199, E-Mail: info@signalbau-huber.com