Freeway and expressway are the main supporters for the long and fast travel demand in metropolitan area, which play the vital roles in urban transportation system, producing huge transport efficiency. In this context, the integration of both in planning and construction is one of the important measures to alleviate the urban traffic problem. Specifically, the following question should be focused on: How to predict the scale of them. In this paper, based on demand analyzing and supply characteristics of freeway and expressway system, a supply-demand balance method for predicting the integrated scale of freeway and expressway was conducted, and the supply-demand balance model was established. Finally, an applied research was carried out as an example in Zhenjiang metropolitan area.
In some large volume trunk road, there isauxiliary road to ensure smooth operation and solve problems along the accessport of entry. Opening is arranged near the road or imported, so that vehiclesinthe auxiliary road can smoothly joins the main road.This paper summarizes three kinds of main form of opening and analyzesits interweaving with Jiang Dong Road in Nanjing as an example.Selects typicalintersections to survey, research on the traffic flow characteristics and applythe simulation method todiscuss effects of different factors.Summarize theapplicable conditions of different forms of opening.
Emergency rescue dispatch is not only influenced by current accidents but also influenced by potential accidents, which are caused by current accidents. In this paper, emergency rescue process is introduced in detail to cognize rescue stages, rescue components and rescue resource. According to relationship of rescue sites and dispatch cost, dispatch paradox of potential accidents is elaborated to show that potential accidents have significant impact upon emergency rescue dispatch. In order to minimize the overall dispatch cost, emergency rescue resource dispatch model of expressway is established based on opportunity cost model, improved scene decomposition algorithm and genetic algorithm (GA) with regard to potential accidents. Considering different rescue resource, dispatch schemes for optimization results are analyzed through case study of Henan expressway, China. Results indicate that these methods could accord with practical dispatch operation for emergency rescue process and emerge good effect.
This article analyzes the limitations of calculating correlation degree based on road sections and built correlation model based on the turning flow of the intersection. In addition to the traditional contributing factors, the model considers two other key factors——turning proportion of intersections and signal phase. Therefore, the proposed model can reflect the spatial and temporal heterogeneity between each turning flows on a road section. A case study to four actual intersections is conducted to test the effectiveness of this model. The results show that the proposed correlation model can better descript the relationship of adjunct intersections and find the critical route for signal coordination.
This study introduces random utility theory to ordinary weighted Voronoi diagram and describes its application in delimiting the services area of a regional highway passenger transport hub. The Euclidean distance was replaced by a utility function of hub’s capacity factor, travel distance, travel time, and monetary travel cost from passenger’s initial origin to the alternative hubs. The service area was delimited based on utility maximization principle and a nested-logit model for transport hub and travel mode. The application shows that the service area of a hub is not consistent with its administrative boundary. It proves Voronoi diagram is a reasonable and practical tool for detecting the service boundary of a hub by offering an integrated angle to recognize the interacting relationship between hub location, transport network, and passenger’s choice behaviors.
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