Characteristics of the Subway in Local Cities

仙台市的地铁于1987年刚刚完工。这是一个很好的机会，进行影响研究之前和之后的地铁引进。本文的目的是分析地铁的特点。具体目标如下：1.在两个不同的时段对地铁的影响进行实地调查。一个是地铁引入之前，一个是地铁引入之后。2.分析地铁用户的特点，特别是找出曾经使用过的交通方式。3.建立模态选择模型，以确定前后参数的作用。4.为了找到合适的政策来刺激未来的地铁使用。关于仙台的地铁，只有少数人从汽车选择地铁。地铁的大部分乘客已经从公交车用户转移。模型分析的结果如下：1.交通方式选择模型中最重要的变量是市中心停车场的可用性。2.第二个重要的变量是汽车的可用性。由于私家车是最方便的通勤方式，如果有车，人们会尽量使用。从地铁引入前和引入后的模型结果来看，随着服务水平的提高，节省时间等服务变量的重要性会增加。在仙台这样的中等城市，地铁换乘造成的时间损失似乎很大。

The subway in Sendai City was just completed in 1987. It was a great chance to conduct an impact study both before and after the introduction of the subway. The purpose of this paper is to analyze the characteristics of the subway. And the specific objectives are as fallows.1. To conduct field surveys of subway impact in different two periodical time. One is before the introduction of the subway and the other is after the introduction of the subway. 2. To Analyze the characteristics of the subway user, especially, to find the transportation mode ever used. 3. To build up a modal choice models in order to determine the role of parameters for both before and after. 4. To find the appropriate policies to stimulate the subway usage in the future.With regard to the subway in Sendai, only a few people changed their choice of mode from car to subway. Most of the passengers of the subway have shifted from the bus users. The results of the model analysis are as follows:1. The most important variable of the modal choice model is the an availability of the parking lots in downtown. 2. The second important variable is an availability of the car as it is. Because private car is the most convenient mode for commuting, if car is available then they try to use it. Results from the models of both before introduction of the subway and after introduction of the subway, it was found that by leveling up of the services, the importance of the service variables such as time saving would increase. In a middle-sized city such as Sendai, time's loss is caused by transfer at the subway stations seems to be significant.