AIDS TO TRAFFIC MANAGEMENT. EQUIPMENT FOR VEHICLE CLASSIFICATION, SPEED WARNING AND VEHICLE HEIGHT DETECTION

The article describes a vehicle classification system and methods of speed warning and vehicle overheight detection that have been installed in Hampshire. The classification package, designed by TRRL and industry, installed on a dual carriageway carrying between 25000 and 60000 vehicles per day, groups traffic into 25 types. It is also possible to record on a data cartridge or thermalprinter, details of the vehicle speed, lane occupancy, headway, length and wheelbase. In the normal unmanned automatic running mode, data are stored and a summary table transferred every hour onto cartridge. Speed warning signs, triggered from buried inductive loops have been installed, whereby a sign, complete with four flashing amberlights, is activated by speeding vehicles. Three village sites are being used in conjunction with TRRL in an experiment to determine the effect upon motorists. Infra-red height detectors have been set up on the approaches to two low bridges, which when activated illuminate a sign warning drivers to divert. The detectors are programmed so that only vehicles approaching the bridge can activate the system. Considerable benefits are being derived by the schemes in accident and environmental terms and also in the design of road pavements. (TRRL)

  • Corporate Authors:

    Institution of Municipal Engineers

    25 Eccleston Square
    London SW1 V1NX,   England 
  • Authors:
    • Selby, D L
  • Publication Date: 1980-12

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00334937
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM