American Economic Journal: Applied Economics · 2021 · Yizhen Gu、Chang Jiang、Junfu Zhang、Ben Zou
中文摘要
本文通过考察中国45条地铁线路的开通并使用详细的道路车速数据,研究地铁能否缓解道路拥堵。双重差分估计发现,在地铁线路开通后的第一年,附近道路高峰时段的车速提高约4%。该效应在初始拥堵的道路上最为显著,并随与新地铁线路距离的增加而递减。道路车速方面的证据得到了交通方式之间替代模式的印证。利用来自北京的辅助数据,我们测算出车速加快为每次汽车或公交通勤节省的时间价值0.10美元。
Abstract
We study whether subways alleviate road congestion by examining 45 subway line launches in China and by using detailed data on road speed. Our difference-in-differences estimation finds that in the first year after a subway line is launched, rush hour speed on nearby roads increases by about 4 percent. The effect is most prominent in initially congested roads and declines over distance to the new subway line. Evidence on road speed is corroborated with substitution patterns among modes of transportation. Using auxiliary data from Beijing, we calculate that the time savings for each automobile or bus commute from faster speed is worth US$0.10.