回顾近 2 0年来北京市交通的发展 ,可以说喜忧参半。喜的是 ,由于政府加大了对道路基础设施的投入 ,使得道路等基础设施有了突飞猛进的发展 ,这是有目共睹的巨大成绩。忧的是 ,由于机动车保有量以惊人的速度上涨 ,道路交通的拥挤程度逐年增加 ,出行不仅时间加长而且变得困难 ;? Recalling the past 20 years the development of traffic in Beijing, we can say that mixed. The good news is that this huge increase has been made evident by the government's stepping up its investment in road infrastructure and by leaps and bounds in the infrastructure such as roads. The worry is that as motor vehicle ownership increases at an alarming rate, the degree of congestion in road traffic is increasing year by year, making travel longer and harder;