Fuel consumption is measured by operating passenger car and tractor-trailer on two interstate roadway sites in Florida. Each roadway site contains both asphalt pavement and concrete pavement with similar roughness, traffic and environmental condition. Comparison reveals that the average fuel consumption differences between vehicles operating on asphalt pavement and concrete pavement at given test condition are 4.04% for tractor-trailer and 2.50% for passenger car, with a fuel saving on concrete pavement. The fuel consumption differences are found statistically significant at 95% confidence level for both vehicle types. Test data are also used to calibrate the Highway Development and Management IV (HDM-4) fuel consumption model and model coefficients are obtained for four sets of observations. Field measurement and prediction by calibrated model shows generally good agreement. Finally, the effect of wind speed and direction on vehicle fuel consumption is investigated and modified equations are recommended for HDM-based aerodynamic resistance calculation with Florida’s condition.
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