This paper endeavours to place the roadside free acceleration test in context with type testing and to illustrate the limitation of the test. First the different methods of measuring smoke are discussed and the need for choosing one as a standard. Next the basis of the ECE smoke limits is explained since these form the basis against which roadside checking must be judged. These limits are shown to be much more severe than the equivalent US limits. The factors affecting the choice of roadside test are considered and how the free acceleration test is the only currently acceptable method. The limited correlation between free acceleration and steady-state test is illustrated and the effects of this on the usefulness of the test are discussed together with possible improvements which might result from changes of instrument specification.

  • Corporate Authors:

    International Days of Road Safety Conference

    14 rue due Gouvernement Provisoire
    Brussels 1000,   Belgium 
  • Authors:
    • Fosberry, RAC
  • Publication Date: 1973

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 29 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00263244
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: ITRD, TRIS
  • Created Date: Nov 20 1974 12:00AM