TRUCK PERFORMANCE CURVES REFLECTIVE OF TRUCK AND PAVEMENT CHARACTERISTICS

The paper utilizes a linearly increasing variable power vehicle dynamics model to develop the TRUCKSIM software for the modeling of truck acceleration behavior along grade sections. The TRUCKSIM software is demonstrated to produce truck performance curves that are consistent with the HCM procedures for a 120 kg/kW (200 lb/hp) truck equipped with radial tires traveling on a fair asphalt surface (Pavement Serviceability Index between 1.5 and 3.0). Using the software, the sensitivity of truck performance curves to roadway and truck characteristics are quantified. Subsequently, truck performance curves that are reflective of in-field truck characteristics are developed. These truck performance curves are intended to enhance the Highway Capacity Manual (HCM) procedures in locating truck climbing lanes. Key words: Truck modeling, vehicle dynamics, roadway design, truck climbing lanes