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| THE STUDY ON EFFECT OF TIME-SPACE ASTRINGENCY OF EXPRESSWAY NETWORK——A Case of Henan Province |
| NIU Shu-hai |
| School of Business of Zhengzhou University, Zhengzhou 450001, China |
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Abstract Expressway construction is of great importance to regional economic development and regional spatial pattern evolvement.It has become a focus in modern transport geography and regional economics researches.With the index such as accessibility coefficient and beta index,etc,the author examines the impact of expressway with topology method,and classifies the stage of development into three stages.The first is tree network,this stage is the first stage,and the expressway network has the most simply network structure,the second stage is loop network,and the network improve in this stage,the third stage is Lattice network,and this is the most advanced network,the number of connection exceeds the one of nodes,and forms many closed loops.
The result of expressway accessibility is "time-spatial astringency".So "time-spatial astringency" withers away with "Obstacle of geographic space".As a result,expressway network promotes the linking of inter-region and trans-region.As the expressway network goes to mature,the change of accessibility is different in different region and city.generally speaking,the grade of accessibility in center of network is highest,and the region far from the center is lowest.
Based on analysis mentioned above,some conclusions are put forward:Firstly,evolvement of expressway network is a process of gradual change;Secondly,time-spatial astringency of expressway construction influences the structure of regional space and economy,accelerates the change of urban system function and the transfer of regional industry;Thirdly,the expressway province must expand in Henan.The changing situation of the spatial structure of the accessibility in Henan is just a fleeting period in the transport network development.The expressway construction has high development potential,and Henan must expressway construction in the developing region in order to make the accessibility of the expressway network at the same level.Finally,some advice was put forward to study the effect of expressway network.
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Received: 17 September 2004
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2005, Vol. 20 
