American Society of Civil Engineers


Analytical Model to Determine the Influence of Horizontal Alignment of Two-Axle Heavy Vehicles on Upgrades


by Stergios Mavromatis, (Dr., Researcher, Dept. of Rural and Surveying Engrg., Natl. Tech. Univ. of Athens, 9 Hiroon Polytechniou St., GR-15780 Athens, Greece. E-mail: stemavro@survey.ntua.gr) and Basil Psarianos, (Assoc. Prof., Dept. of Rural and Surveying Engrg., Natl. Tech. Univ. of Athens, 9 Hiroon Polytechniou St., GR-15780 Athens, Greece. E-mail: psari@survey.ntua.gr)

Journal of Transportation Engineering, Vol. 129, No. 6, November/December 2003, pp. 583-589, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-947X(2003)129:6(583))

     Access full text
     Purchase Subscription
     Permissions for Reuse  

Document type: Journal Paper
Abstract: Existing design policies determine the speed variation of vehicles on upgrades solely as a function of specific values: initial speed, grade, and weight to power ratio. This paper establishes a dynamic model that considers in addition the influence of the roadway’s horizontal alignment. The model was validated on both tangents (using existing speed-distance profiles and similar simulation models) and curves (by an existing simulation model and field measurements). The model output was examined on a roadway alignment. It was found that sharp horizontal curves influence the speed of heavy vehicles significantly on mild upgrades. Therefore the conventional speed profile determination has to be supplemented by incorporating the horizontal alignment as well. The proposed model can be used to provide solutions in a more efficient and realistic way than does the current practice.


ASCE Subject Headings:
Alignment
Dynamic models
Friction
Highways and roads
Vehicles