DOES THE LOWER MAXIMUM SPEED LIMIT AFFECT THE ECONOMY OF ROAD TRANSPORT?

HET DIE LAER SNEL HEIDSGRENSE 'N INVLOED OP DIE EKONOMIE VAN PADVERVOER

A heavy motor vehicle, travelling at 100 km/h or more, is dangerous on most south African roads, and from a road safety point of view, such high speeds are to be avoided. However, the question now arises: if all heavy vehicles are limited to a maximum speed of 80 km/h, to what extent does this influence the economy of road transportation? The fixed cost of just one of the many thousands of heavy motor vehicles can easily amount to r15 000 p.a. If the utilization of such a vehicle can increase by travelling at a higher speed, the fixed cost component per unit of transportation work done diminishes. On the other hand, the cost of fuel and tyre and vehicle wear and tear per unit increases at a quadratically increasing rate, as the cruising speed of the vehicle increases. Clearly, minimum transport cost per unit, will be had at some optimum speed. An analysis is made to determine the optimum speed for heavy motor vehicles, and it is found that for normal south African conditions, this speed is lower than 80 km/h. The maximum speed limit of 80 km/h, therefore, is not disadvantageous to the economics of heavy road transportation. It has in fact, a beneficial effect, as the authorities and motoring public help the commercial transporter by ensuring that the heavy vehicles do not travel above the maximum speed. (a) this paper was presented at the 1974 symposium on "the impact of fuel saving laws on road safety," held in pretoria, south Africa. The covering abstract for the symposium is IRRD Abstract No. 213021. /TRRL/

  • Availability:
  • Corporate Authors:

    National Road Safety Council

    Private Bag, X147
    Pretoria 0001,   South Africa 
  • Authors:
    • Burger, J J
  • Publication Date: 1974-6-7

Media Info

  • Features: Figures;
  • Pagination: p. 40-49
  • Serial:
    • ROBOT
    • Issue Number: 74
    • Publisher: SNELCO-PRO PUBLIC RELATIONS CONSULTANTS
    • ISSN: 0035-7391

Subject/Index Terms

Filing Info

  • Accession Number: 00125632
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM