Urban road network optimization method under optimal reachability

Abstract

The invention discloses an urban road network optimization method under optimal reachability. The method includes the following steps that: a research area is defined, road network geographic information in the research area is obtained, wherein the road network geographic information contains road grade, road length, design vehicle speed and road network connection condition; based on the complex network theory, an urban topological network is constructed, a node importance calculation method is put forward, the importance degree of each node is calculated; the node importance is introduced into a reachability calculation method, and the reachability value of the urban road network is calculated; and with the optimal accessibility adopted as an objective function, a road network optimization model is established, a genetic algorithm is selected to solve the optimization model, and an optimized layout decision is provided on the basis of an existing road network, so that a decision can be provided for the selection of an optimal scheme for road network reorganization and expansion. With the method of the invention adopted, on the one hand, the intensity of the connection between traffic communities in a city can be reflected, on the other hand, the optimization model is established with the optimal accessibility as the objective function, a decision can be provided for urban road network layout optimization, and therefore, road network resources can be rationally allocated, and operation efficiency of urban traffic can be improved.

Description

technical field [0001] The invention belongs to the field of urban road network optimization, in particular to an urban road network optimization decision under the condition of optimal accessibility. Background technique [0002] With the acceleration of urbanization, urban traffic is becoming increasingly tense, traffic congestion, delays and other phenomena are becoming more and more prominent, which to a certain extent affects the development of urban economy and the improvement of people's living standards. One of the important ways to alleviate traffic congestion is to optimize the traffic system, and an important means to optimize the traffic system is to optimize the network layout. Therefore, how to adapt to the urban development strategy, rationally improve the urban road network layout, and improve the efficiency of urban traffic operation has become a necessary research topic. [0003] As early as the last century, scholars at home and abroad have conducted rese...

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Problems solved by technology

However, most of the research content starts from the perspective of the system, and the shortest travel time and the lowest construction cost are selected as the objective function. This method cannot accurately reflect the connection strength between the various traffic districts in the city, that is, it cannot accurately predict the development trend of urban traffic, and it is easy to cause resource allocation. Unreasonable, unable to effectively solve problems such as low traffic operation efficiency

In addition, urban land is in short supply, and urban roads occupy a limited area. If roads and bridges are built blindly and optimized without restraint, it does not conform to the actual development situation and cannot solve the problem of urban traffic congestion at its root.

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