自行车为我国人民目前的主要交通工具。自行车道(包括人力、兽力车)在国外中级以上道路较为普遍。有资料证明:当昼夜交通量中自行车超过250辆,汽车超过2000辆时,必须修建自行车道。 现以横穿我市的国道汉(口)——沙(市)公路为例。 汉沙公路原设计为新二级公路(实为三级),市境 Bicycles are the main transport for our people nowadays. Bicycle lanes (including human and animal vehicles) in the middle and above the road more common. Data have proved that: when the daily traffic volume of more than 250 bicycles, cars more than 2000, you must build a bike lane. Take the city across the country now Han (mouth) - Sha (city) highway as an example. Han Sha Road, the original design for the new two-class highway (in fact, three), city territory