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Edition:Final Report: September 1984 - November 1986
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Abstract:This report is the final report of Study 2-8-85-476, entitled "Investigate and Improve Current Method of Predicting Load Equivalents for Design." The report gives details of the results of a survey of truck lane distribution on Interstate multilane facilities in Texas. The data were collected for 24 consecutive hours during the summer at nine locations in both directions of 4-lane, 6-lane, and 8-lane facilities, and in urban and rural settings Summary information is presented in the report and compared with current design practice in Texas, recommendations in the current AASHTO pavement design guide, predictions from the NCHRP Report 277 equations for truck lane distributions. Although the data are not extensive enough to warrant the development of new predictive equations, they do show significant deviations from the previous and current methods and indicate that even the NCHRP Report 277 equations are conservative when compared with Texas traffic conditions. The effects of travel direction, urban or rural environment, and percent trucks in the traffic stream appear to be significant in altering the truck lane distributions.
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