Modelling the relationship between vehicle speed and road radius, degree of curved, and grade in Wringin Highway Bondowoso

Abstract

Road geometric are the component design of the road. Road geometric design has provisions such as road classification, design criteria, road components, cross section, visibility, vertical alignment, and horizontal alignment. Based on Bina Marga (1997), the design speed on the horizontal alignment is influenced by roads radius (R), degree of curved (D), the coefficient of friction (F), superelevation (e), and the level of attainment of road crossing (Ls). In the research of Fitzpatrick (2000), it was explained that the grade affected of vehicle speed on thecurved. This research was conducted to find out the modeling the relationship between vehicle speed and road,s radius, degree of curved, and grade in Wringin Highway Bondowoso. This research uses a non linear regression analysis method. Primary and secondary data include vehicle speed, roads radius, degree of curved, and grade. In this research, vehicle speed as the dependent variable and roads radius, degree of curved, and grade as the independent variable. The analysis results obtained a grade of -10% <12% which is the best result for the model relationship vehicle speed with radius. At a grade of -10% to -12%, get the value R2= 0.933 and Y = -0.024x2 + 1.802x+5.165 using the polynomial regression model. R2 values indicate grade and radius affect the amount of vehicle speed by 93.3%, while 6.7% is influenced by other factors. The 10% to 12% grade gets the value R2 = 0.993 and Y = 0.043x2 - 3.139x + 91.65 using the polynomial regression model. This value indicates grade and radius affect the amount of vehicle speed by 99.3%, while 0.7% is influenced by other factors.