一、问题的提出交通系统是城市的生长轴,以珠江三角洲为例,广深高速的建成带动了广州、东莞、深圳的经济乃至社会的进步,大量工业区、商业区、居住区纷纷出现,形成了一个强大的经济带,引发交通量成几何级数的增长,甚至出现严重拥挤,车辆无法高速运行,经济成 First, the problem put forward Transportation system is the growth axis of the city to the Pearl River Delta, for example, the construction of Guangzhou-Shenzhen has led Guangzhou, Dongguan, Shenzhen’s economic and social progress, a large number of industrial areas, commercial areas, residential areas have emerged, The formation of a strong economic belt has led to a geometric increase in traffic volume and even severe congestion. Vehicles can not operate at high speeds.