Traffic Problem and Countermeasure of Arterial Road at Rapid urbanization region ---Take Huajiang Section of Cao’an Road as Example Sun Qiaoyan1, Yang Xiaofang2, Zhu Weigang3 (1.zhong zi hua ke traffic construction technology co.ltd Beijing 100037;2. Department of Road and Traffic Engineering, University of Shanghai for Science and Technology. Shanghai 200093;3.shanghai urban planning&design research institute shanghai 200040) Abstract: some important roads between different cities got into traffic jam at urbanization regions as a result of the influence between through traffic and interior traffic.