城市轨道交通在城市交通系统中的作用及其发展的必然性(精)

ROLE OF URBAN RAIL TRANSIT IN URBAN TFAFFIC SYSTEM AND ITS INEVITABILITY OF DEVELOPMENT

XU Xiaofan1, SHEN Liping2, LI Hong3 and GAO Shilian4

1Department of Transportation, Emei Campus of Southwest Jiaotong University, Emei 614200,China,PH(8608335198352,email: cdzy13@

2Department of Transportation, Emei Campus of Southwest Jiaotong University, Emei 614200,China,PH(8608335198454,email: xsh200651@

3Sichuan food cadre schools, Chengdu 610091, China, PH (86028-66387061, Mobile (8613608073597, email:bobi88@

4Collage of Transportation, Southwest Jiaotong University, Chengdu 610031,China, PH(8602887603901,email: pussycat@

Abstract: This paper illustrates the urban rail transit system’s roles in the city from four aspects: First, to promote the structure rationalization of urban traffic system; second, to support the intensive urban land use; third, to guide the city to change the usage of land patterns during outward expansion; fourth, to clean up the environment, save energy, construct "green transportation." On this basis, revealing the necessity of the rapid development of China's urban rail transit: acceleration of urbanization, the rapid expansion of urban areas; intensification of urban land use, the high concentration of attracting amount; acceleration of the process of urban transport motorized, lack of road resources, all need the great development of rapid rail transit system. Urban rail transit will be the key infrastructure investment during" Twelfth Five-Year Plan", China will welcome the golden decade of urban rail transit construction.

Key words:urban rail transit, green transport, role, development

1 Introduction

With the acceleration of the pace of urbanization and urban transport motorization in China, inevitably, there will be some structural contradictions in the process of development by leaps and bounds, so it makes serious "traffic jams" in big cities. One of the important measures to solve the traffic congestion is to accelerate the construction of urban rail transit. Because of the urban transport system is particularly strong in synthesized aspects, only relying on the construction of urban rail transit can not fundamentally solve the problem of “traffic congestion", but policymakers would be misleading produced films of urban rail transport absurd awareness, and even lead to wrong decisions. Therefore, the need for urban transport "role" has an objective and correct understanding.

2 Promote the structure Rationalization of Urban Traffic System

The acceleration of urbanization process, so that continued outward expansion

of urban space area, the increased proportion of medium-long distance travel,

medium-long travel time in the "unacceptable" people have increased (see Table

1.This from is a illustration of an objective need for additional mass rapid rail transit

system, shown in Figure 1.

Table 1. Will survey on travel time travelers

Travel purpose Ideal (min Acceptable.. (min Tolerable

(min

45 30

60

25 35