Abstract
The accessibility index is designed by using the inverse of time distance and population weighted average value to research the city accessibilities in a region, with the definition of time threshold, which not only considers the transportation characteristics of each segment in the region, but also effectively reduces the digital effects from measurement on the analysis results, makes the analysis result could better reflect the reality at the same time. The results show that the Henan highway traffic network is relatively perfect, basically have been forming a high speed transportation system with the provincial capital, Zhengzhou, as the center. The city accessibility indexes in Henan province show the characteristics of normal distribution, the Accessibility differences are relatively obvious, the regional distribution of highway is very unbalanced. The accessibilities have high-high and low-low aggregation phenomenon, the Accessibility along the north to South and northwest to southeast direction becomes worse; the accessibility distribution and population distribution exist obvious departure.
Highlights
In the paper, based on Henan Province Ordinary traffic network, a new accessibility index is constructed by using the inverse of time distance and populationweighted average value, to evaluate the accessibilities between cities in the province and the sophistication of highway traffic network, in order to provide scientific reference for the region to further improve the network
The city accessibility index in a highway traffic network is a degree of accessibility from one city to all adjacent cities, usually by using the weighted average distances deriving from population, regional GDP, passenger and freight traffic transport amount as the weighted, the optimum route number, the sum of shortest distance, they describe the numerical characteristics of city accessibility in different aspects[5,6,7,8,9,10,11,12,13,14,15]
The time threshold is set as the shortest travel time between cities on the ordinary traffic network(Correspond to highway traffic network), two routes on the highway traffic network are considered to be the same if their repetition rate is greater than 50%
Summary
The accessibility means the interactions between the nodes in a traffic network and the traffic convenience from one node to others, which is an Important tools to evaluate the maturity of a regional traffic network structure [1,2,3], is firstly proposed by Dr Hansen to study its impact on landuse in a region. Since the 1980s, Fractal theory, network theory, space syntax, shortest path, spatial topology were introduce in the study of city accessibility, which enriched the connotation of accessibility study, and got some valuable research results These studies mainly focused on simple traffic network and used Euclidean distance measurement [5,6,7,8,9,10,11,12,13,14].With a complex highway traffic network gradually forming in China, city links gradually are becoming more diversity, national highway, fast-track lines, and more than one highway lines with different traffic characteristics constitute the main link between the cities in a region. Spatial data in the research comes from Henan traffic network database [19], the time measure bases on the empirical data of travelling through road junctions and segments between January to September in 2015, the shortest time distance between two points is calculated by NEDS algorithm[20]
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