欧洲各地大都市街道纵横、人口密集,每天上下班行人和进出城市的游客熙熙攘攘。许多城市都在努力设计规划科学合理的公共交运网络,以避免发生交通堵塞、安全事故及环境污染,避免大都市人居环境条件恶化。欧洲国家大都市一般都采用横向集中统一、纵向实行决策 Metropolitan streets across Europe, densely populated, daily commuters and tourists entering and leaving the city bustling. Many cities are striving to design and plan a scientific and rational public transport network to avoid traffic jams, accidents and environmental pollution and to avoid deterioration of living conditions in the metropolises. European countries generally adopt a centralized horizontal integration of the city, the vertical implementation of policy-making