The findings of a current study in the state of Texas to evaluate some of the effects of allowing large and heavier trucks to operate on the highway system are presented. Four scenarios, each of which includes four to six vehicle classes, were studied to determine the effects each would have on highway bridge costs, truck operating costs, and fuel consumption over a 20-year planning period. One scenario represents that existing legal situation, and the other three range from a weight-only increase to variations in size and weight. City streets and county roads are not included in the analysis. One scenario that includes eastern-region double-trailer and triple-trailer combinations compares favorably with the current situation in terms of estimated highway costs. This scenario is characterized by truck units that have a maximum length of 32 m (105 ft), maximum width of 2.59 m (102 in), and gross vehicle weight (axle) of 468.9 kN (105,500 lbf) and retains the current bridge formula. A maximum truck unit height of 4.11 m (13.5 ft) is also retained. Savings in track operating costs and fuel consumption are estimated to be significant. The full results for each scenario and highway class are given. The highway costs used in the analysis reflect costs related to pavements and bridges; they do not include any consideration of changes in geometric design conditions or costs asociated with public safety. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 78-83
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00319390
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 27 1980 12:00AM