1995年11月14日至12月3日,我参加由市计委组织的市信息系统管理研修团赴美国进行了为期20天的研修。在美期间,无论是在城市,还是在乡村,我们到处可以看到四通八达、密如蛛网的高速公路。这是美国从五十年代开始大力投资建造的。这纵横交错、连通全国各地的州际公路网络,给人们出行、货物运输,甚至整个经济的运行,带来了极大的便利。高速公路网络还降低了运输成本,提 From November 14, 1995 to December 3, 1995, I participated in a 20-day training program in the United States attended by a municipal information system management and training group organized by the Municipal Planning Commission. During the United States, whether in the city or in the countryside, we can see the dense, cobwebbed motorways everywhere. This is what the United States has invested heavily in since the 1950s. This crisscrossing and interconnecting interstate highway network across the country has brought great convenience to people traveling, transporting goods and even running the entire economy. The highway network also reduces transportation costs, mentioning