Analysis Method of External Traffic Demand in City Area

To overcome the disadvantages of the existing method, a “dual four-stage” method” is put forward to analyze external traffic demand in city area considering the characteristics of external traffic. The method is carried out by two steps, and in the first step the city area is regarded as an overall traffic zone and the “four-stage” method of regional traffic demand analysis is used to obtain the total generation volumes of internal-external (IE) & external-internal (EI) trips of city area as well as the traffic volumes of both directions of all the arterial highways through the city in planning years. In the second step, the planning area of city is divided into several parts as internal traffic zones, and the external traffic zones are set near the junctions of highways and cordon line, then the “four-stage” method is applied for the second time to obtain the trip generation and distribution of IE & EI trips and (external-external) EE trips for internal traffic zones and external traffic zones in planning years. The application of the analysis on external traffic demand for comprehensive transportation planning of Zhenjiang City shows that the proposed method combines the advantages of influence area method and Cordon Line method it overcomes disadvantages of the two methods, and the results are more consistent with the real situation.

摘要为克服现有对外交通需求分析方法的不足，根据城市结点对外交通的特点，提出了一种“双四阶段”法来进行城市结点对外交通需求分析．该方法分两步进行，其中第一步为区域层面的交通分析，将城市结点作为一个整体交通分区，按区域交通需求分析的“四阶段”法，得到规划年城市结点出入境交通生成总量及经过城市的各条干线公路进、出城方向的路段交通量；第二步为结点层面的交通分析，将城市结点规划区划分为若干个内部交通分区，并在干线公路与规划境界线交叉处设置对外交通分区，运用第二轮“四阶段”法，得到规划年内部交通分区、对外交通分区的出入境交通、过境交通生成量及其间的分布量．镇江市综合交通规划对外交通分析预测应用实践表明，该方法综合了影响区法和境界线法的优点，克服了二者所存在的固有缺陷，因而分析结果更加符合实际情况．