本文以陕西省为例,采用加权平均出行时间指标,对县级尺度的到区内节点、火车站、主要干线公路和机场的交通可达性分别进行了评价,结果表明:陕北的东北部、西北部,陕南的东南部各方面交通可达性表现都很差,西安及周围临近县市各方面则表现良好。通过对到区内节点可达性和三种方式的区外交通可达性加权求和得出的区域交通可达性进行的研究表明,陕西形成了以西安与其周围临近县市组成的片状可达性低值区,可达性良好;陕北的大部分及陕南的南部可达性差;陕西省整体可达性分布不均衡。陕西省今后交通建设的重点应是提高区域交通可达性的均衡性。

Regional transport accessibility is the combination of accessibility to the intra-regional nodes and the extra-regional nodes. Transport network plays an important role in regional development, and the comprehensive indicator in evaluating the network traffic situation is regional transport accessibility. The main transport modes in Shaanxi Province are highway, railway and aircraft. Taking Shaanxi Province as an example, the author uses the weighted average travel times index to evaluate the county-level transport accessibility to intra-regional nodes, train stations, main roads and airports. The result shows that, in terms of accessibility to intra-regional nodes, the best region to Xi'an and its surrounding counties is the one whose accessibility value is below 100min; the better region radiates along the highway; the accessibility value of the counties in Northeast, and Northwest Shaanxi and the Southeast of South Shaanxi is the lowest. As to accessibility to railway station, most parts in Guanzhong are above middle-level and the poorest places are in north and west parts of counties in Northern Shaanxi. Regarding the accessibility to highway, Guanzhong is better than North Shaanxi. As to the accessibility to airport, the regions near Xi'an Xianyang International Airport are the best, and the remote areas in North and South Shaanxi are the worst; with regard to the accessibility in general, it is poor in Northeast and Northwest counties of North Shaanxi, and it is the best in Xi'an and its surrounding counties. The study of transport accessibility indicates that the accessibility of Shaanxi province is uneven. Therefore, the Shaanxi Transportation Administration should give the first priority to improving the balance of regional transport accessibility in order to narrow the gap between North Shaanxi, South Shaanxi and Guanzhong Plain.