From their opening, the traffic flowing in the Holland and Lincoln tunnels in New York has been managed intensively. The control system described in this paper may well be useful for traffic management in other tunnels but may not apply directly to surface arterials since tunnel traffic is probibited from changing lanes and these tunnels do not have any intermediate on- or off-ramps. The system consists of an automatic surveillance and control system and uses induction loop detectors, the output from which is processed in computers. A full description of the detection system and the computer system is given. There are two main functions of the automatic system. First, by examining three criteria on vehicle velocity, lane occupancy and vehicle headway at 15 second intervals, the system determines when a stoppage in the tunnel may have occurred. Second, by monitoring traffic density and traffic speed, signals at the entrance to a tunnel are adjusted in such a way so as to maximise the traffic flow through the tunnel. The rules for changing the traffic signals are explained in detail. /TRRL/

  • Availability:
  • Corporate Authors:

    Printerhall Limited

    29 Newmart Street
    London W1P 3PE,   England 
  • Authors:
    • Foote, R S
  • Publication Date: 1974-10


  • English

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Filing Info

  • Accession Number: 00098108
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 18 1975 12:00AM