Analysis of Traffic Capacity on the Freeway Weaving Area Based on Linear Regression

In order to further study traffic capacity and service level of freeways, this paper establishes a multiple linear regression model to analyze traffic capacity of an A-type weaving area of a freeway based on data in HCM2000. After analyzing, relationships between capacity, length, lanes, the velocity of cars, and weaving ratios of weaving area were obtained and the model parameters were determined by fitting of the data. Validation was proven by verifying the road and traffic data from a weaving area of one expressway. The results show that the degrees of fittness of the parameters and other influence factors for the reciprocal of capacity and length in the weaving area are not less than 0.963 and 0.929, respectively. The traffic capacity of weaving area is inversely related to the length and the lanes but has positive correlation with weaving ratios. The relative errors of the model are within 0.1.