Gives an account of TARA, a computer based system for recording and analysing traffic and other highway and transportation information, that allows cross-referencing of the specific applications. A link and node system is used to define the network in the form of a four file model. File-accessing and file-handling routines extract the required information. Linked to these are the data files and interrogation programs. Details are given of the network modelling system which is kept up-to-date by means of an edit program, and of the plotting programs which include a range of options such as the inclusion of drawing frame details, legend details, the use of prescribed symbols and lines, labelling facilities, and different sizes and scales. Information is given on the two levels of operation of the road traffic system programs. Traffic information (counts and speed) data are processed and stored on raw data files which up-date a master file. The level 1 program interrogates the master file according to appropriate parameters to obtain the required information. The level 2 program produces a file of summarized level 1 information. Reference is made to the need for the system to accommodate circumstances where no data (or limited data) exist. Information is also given on the accident system which has been designed to make use of (but not duplicate) existing local authority accident systems. The main use of the system is to provide details of roads where the accident rate is reaching an intervention level. Details are given of the formula developed for this purpose using a moving cursor technique. /TRRL/

  • Availability:
  • Corporate Authors:

    Printerhall Limited

    29 Newmart Street
    London W1P 3PE,   England 
  • Authors:
    • Slatter, DAE
  • Publication Date: 1976-10


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00149866
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Apr 13 1977 12:00AM