A FAILSAFE, REMOTELY MONITORED OVERHEIGHT VEHICLE MEASUREMENT SYSTEM . 15TH ARRB CONFERENCE, DARWIN, NORTHERN TERRITORY, 26-31 AUGUST 1990; PROCEEDINGS PARTS 1 TO 7

After a spate of serious accidents caused by high vehicles hitting bridges, it was decided to develop a height measurement system based on infra-red detectors. The system is controlled by an existing traffic signal controller, which is linked by telephone line to a regional computer. Operation of the site can be monitored at the Traffic Control & Communications Centre (TCCC), using the Signal Co-ordination of Regional Areas of Melbourne (SCRAM) central monitoring computer. There are three infra-red beams per site, set up in opposed mode, two beside each other at the declared height of the bridge and a lower beam set at 3.3 metres to give a confirmation signal to underheight vehicles. A loop is cut into one lane and only vehicles in that lane are measured. A sign indicates which lane to use. The output display consists of two messages with a signal beside each message to indicate which one is valid. The messages are 'Detour' if the vehicle is too high, or 'Use underpass' if the high beam is not broken. The system is continuously monitored and will automatically shut down within ten seconds if a major failure occurs. If only one beam fails an alarm is sent via the SCRAM network to the control centre indicating which beam is faulty. (Author/TRRL)

  • Availability:
  • Corporate Authors:

    ARRB

    Melbourne, Victoria  Australia 
  • Authors:
    • Moss, C
  • Publication Date: 1990

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00609374
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jun 30 1991 12:00AM