The many changes in truck engine displacement and truck horsepower and the noticeable increase in the number of recreational vehicles indicated a need to reasses current climbing land design practices. The research study presents current data characterizing trucks (and combinations) and recreational vehicles on grades. Field data collected at several locations in central and east Texas were analyzed, and speed-distance curves were developed for a range of grade profiles. From an evaluation of the speed-distance curves for the designated 'critical vehicles' (in the truck and recreational vehicle classes), composite critical length of grade charts were devised using a 55 mph approach speed and a range of speed reduction values. Based on this study these revised design charts are recommended for incorporation into current climbing lane design practice.
Speed of Vehicles on Grades
1975
156 pages
Report
No indication
English
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