Prediction Of Vehicle Speed In Two-lane Highway With Three-directions Alignments

Two-lane highway is the most common form of highway in our country,the security of Two-lane highway is serious.The safety of the car on a two-lane highway is manifested in vehicle speed,which is a form expression of the transportation system factors acting on driving behavior.Based on the theory and experiment method to study the three-dimensional linear index of vehicle speed,and we can solve the result of the vehicle speed prediction model.This passage uses the section observated method,respectily measure the vehicle speed four feature points like ZH、HY、YH、HZ on the plane curve.Through analysis,it is concluded that the section85%of the instantaneous speed in each feature points is the vehicle speed.According to the linear characteristic of two-lane highway,the road is divided into three-directions like flat, vertical and horizontal,respectively analysis the radius,CCR,corner in flat;top rake in vertical;lane width,lateral clearance width in horizontal,to obtain each single linear description.Give the priority to the flat,assist to the vertical and horizontal,to obtain the three-dimensional linear index model.Through the sensibility analysis that the radius is the main factor in the three-dimensional linear index model,and the factor has the multiple effects.According to the vehicle speed and the three-dimensional linear index model,bring in the adhibition of the linear scope,to analysis the two-lane highway vehicle speed prediction model.