A TRAFFIC CONTROL SYSTEM FOR AN ACCESS RAMP TO AN URBAN TUNNEL

An urban tunnel under construction is divided into two sections, each of roughly 1.2 km, by a grade-free intersection. Due to reduced visibility on a crest vertical curve, signalisation is required. Vehicles approaching the tunnel in the direction of heavier volumes have to climb an upgrade slope. Since overtaking is prohibited, slow-moving, heavy vehicles will create dense platoons behind them and long gaps ahead of them. The traffic control system has to detect those gaps for giving right-of-way to the entrance ramp. The movements of the last vehicle at the beginning of the gap and the first vehicle ending the gap have to be detected and observed in order to adapt the phasing of the signal lights in a manner that will neither waste time nor interfere with the vehicles in motion. Since a calibration of this microscopic control system under traffic is not acceptable due to the sensitivity of this area, design, testing and calibration are done by means of microscopic simulation.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00410683
• Corporate Authors:

  Printerhall Limited

  29 Newmart Street
  London W1P 3PE,   England 
• Authors:
  • Herkt, S
• Publication Date: 1990-3

Media Info

• Features: Figures;
• Pagination: p. 131-135
• Serial:
  • Traffic Engineering & Control
  • Volume: 31
  • Issue Number: 3
  • Publisher: Hemming Group, Limited
  • ISSN: 0041-0683
  • Serial URL: http://www.tecmagazine.com/

Subject/Index Terms

• TRT Terms: Curves (Geometry); Highway operations; Microsimulation; Signal lights; Simulation; Traffic control; Traffic signal control systems; Tunnels; Urban areas; Vehicular tunnels; Visibility
• Uncontrolled Terms: Vertical curvature
• Geographic Terms: United Kingdom
• Old TRIS Terms: Signal systems; Traffic control systems; Tunnel traffic operations
• Subject Areas: Bridges and other structures; Design; Highways; Operations and Traffic Management; Planning and Forecasting; I21: Planning of Transport Infrastructure;

Filing Info

• Accession Number: 00495198
• Record Type: Publication
• Files: TRIS, ATRI
• Created Date: Jul 31 1990 12:00AM