In order to investigate the road network cascading failures mechanism after the introduction of connected automated vehicles (CAV), a road network cascade failure model considering the critical density of a new type of road with mixed traffic flow is developed. The method considers the way of traffic redistribution after failures and captures the effect of mixed traffic flow on the road's ability to resist congestion. In this paper, the urban road network of Xi'an City is taken as an example to study the regular characteristics of the cascading failures of mixed traffic flow. The results show that when the CAV penetration rate reaches 0.6(critical value), the outermost nodes start to resist failures, and the propagation of cascading failures slows down significantly; after the penetration rate exceeds 0.6, the outermost nodes successfully resist failures, and the total size of failures decreases by about 91%. Failure propagation is fastest and largest when attacking the largest node of the traffic flow, and controlling the largest node of the traffic flow is the focus of cascade failure.
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