Traffic simulation method and device for three-dimensional composite expressway

The invention provides a traffic simulation method and device for a three-dimensional composite expressway. The method comprises the following steps: acquiring traffic demand data; according to the positions and functions of the road sections of the three-dimensional composite expressway, a basic road network is generated, and the basic road network has different traffic control measures based on different traffic scenes; and simulating a traffic flow according to the traffic demand data and the traffic control measures. According to the method, the basic road network is generated, the relatively complete road network model is constructed according to the traffic control measures of the basic road network in different traffic scenes, the static infrastructure construction and the traffic control measures of the three-dimensional composite expressway are comprehensively restored, and the road network model is kept in an operable state in combination with the obtained traffic demand data; the traffic operation