Traffic congestion index calculation method

The invention discloses a traffic congestion index calculation method, which comprises the following steps: a, obtaining the traffic flow and the average running speed of vehicles of each road segment in a road network according to data provided by a road network vehicle detection equipment; b, calculating the number of vehicles contained in each road segment in the road network according to the traffic flow and the average running speed obtained in the step a; c, constructing a congestion intensity function taking the speed as an independent variable; d, substituting the speed of each road segment into the congestion intensity function to obtain the average congestion intensity of the road segment; and e, solving the weighted average of the congestion intensity of the whole road network by taking the number of the vehicles of each road segment as the weight number of the road segment, wherein the weighted average is used as the traffic congestion index of the road network. According to the traffic congestion index calculation method disclosed by the invention, psychological feelings of the publics can be relevantly reflected.