Abstract：In order to study the impact of traffic accidents on expressway traffic flow, a forced lane change rule was introduced based on the two-lane safe distance cellular automaton model, and a highway vehicle congestion model considering the heterogeneity of vehicles was established.The heterogeneous traffic flow on expressways was used by MATLAB numerical simulation, the impact of the duration of traffic accidents and the proportion of heavy trucks under different traffic densities on expressway congestion traffic flow was analyzed. Research shows that the duration of traffic accidents and the proportion of heavy trucks have a significant impact on the traffic flow of highway congestion; when the vehicle density is greater than 4veh/km and less than 80veh/km, the duration of the traffic accident has a significant impact on traffic flow. And the longer the duration, the greater the impact influences on the traffic flow; when the vehicle density is less than 30veh/km, the proportion of heavy trucks has a significant impact on the traffic flow, and the larger the proportion, the greater the impact influences on the traffic flow.
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