突发与紧急情形拥堵路段疏导模型的设计与应用OA

[Background]Traffic accidents on expressways often hinder rescue forces within the city from reaching the accident site in a timely manner owing to traffic congestion on urban roads and ex-pressways,thereby delaying rescue operations and severely endangering life and property.[Objec-tive]The objective is to update ambulance rescue routes in real time and reduce travel time to im-prove rescue efficiency.[Method]An urban-route decision-making model and an expressway queue-control model are developed.The urban-route decision-making model converts actual urban trunk roads into cell space using the concept of topology,sets vehicle distribution based on the actual road density,calculates the decision score based on the ratio of the current number of vehicles on the road to the maximum number of vehicles that can be accommodated,and selects the road direction with the lowest score,thereby dynamically updating the ambulance route and enabling the ambulance to reach the expressway toll station in the shortest time.Based on a coordinated queue-planning proto-col,the expressway queue-control model enables vehicles within a certain distance before the acci-dent site on the expressway to form an ambulance team and an ordinary vehicle team after receiving an early-warning notification.The ambulance team can reach the accident site in the shortest time by actively changing lanes or yielding to the preceding team.[Data]The road network map provided by OpenStreetMap,a public road website network platform,and the road density of Linfen at 14:00 on March 19,2024 are used for analysis.[Result]The urban-route decision-making model reduces the time for the ambulance to reach the Linfen toll station of the Beijing-Kunming Expressway by ap-proximately 18%,whereas the expressway queue-control model reduces the time for the ambulance to reach the accident site by approximately 7.27%.[Conclusion]The simulation experiment vali-dates the feasibility and efficiency of the urban-route decision-making and expressway queue-control models.These models considerably reduce the time required to reach accident sites compared with the current scheme,thereby facilitating road rescue.