Modeling Acceleration and Deceleration Rates for Two-Lane Rural Highways Using Global Positioning System Data

Several past studies developed acceleration/deceleration rate models as a function of single explanatory variable. Most them were spot speed with speeds measured at specific locations on curves (usually midpoint the curve) and tangents to determine acceleration deceleration rates. Fewer adopted an estimated value 0.85 m/s2 for both rates while approaching departing curves, respectively. In this study, instrumented vehicles high-end GPS (global positioning system) device used collect continuous profile data two-lane rural highways. The profiles locate beginning end deceleration/acceleration successive road geometric elements calculate rate. influence different design variables was analysed develop regression models. This study also inspeced assumption constant operating horizontal curve. results indicated that mean point curvature (PC) or tangency (PT), curve (MC), in statistically different. Acceleration/deceleration improved accuracy evident from model validation comparison existing literature. highlight significance using considering calibrate