Dangerous chemical road transportation route planning method based on comprehensive risk

The invention discloses a dangerous chemical road transportation route planning method based on a comprehensive risk. The method comprises the following steps: building a dangerous chemical road transportation road network, and calculating a comprehensive risk index of each road segment in the dangerous chemical road transportation road network; obtaining a departure position, a destination position, departure time and latest arrival time of dangerous chemical transportation; abstracting into a weighted graph according to the positions of the intersection points of all the road sections in the interval of the position of the departure place and the position of the destination, and screening edges meeting requirements in the weighted graph; and calculating all paths from the departure position to the destination position of dangerous chemical transportation through the weighted graph subjected to edge screening to obtain a plurality of transportation routes, and calculating the sum of the comprehensive risk in