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Subways and Road Congestion

By Yizhen Gu, Chang Jiang, Junfu Zhang, and Ben Zou

Journal: Applied Economics, April 2021

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 spe...