To study the characteristics of passenger-cargo mixed traffic flow in vehicle-connected environment and the lane change strategy suitable for the mixed traffic flow environment, the relative entropy is introduced to quantify the order of passenger-cargo mixed traffic flow, and on this basis, conditional agglomeration lane change strategy is proposed. The effect of conditional lane change strategy on the capacity and order of mixed traffic flow was studied by cellular automata simulation. The results show that compared with non-agglomeration lane change strategy, CDA(Conditional aggregation) lane change strategy can improve the maximum road capacity by 5.5%~10.5% in mixed traffic flow with different CAV(Connected and autonomous vehicle) penetration rate and passenger-cargo ratio. It can significantly reduce the relative entropy of traffic flow, increase the number of vehicles in CACC(Cooperative adaptive cruise control) queue and improve the orderliness of traffic flow. When the CACC minimum queue size of the conditional lane change strategy is 4~5 vehicles, the road capacity can be improved the most.
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