Subways and Road Congestion

@article{Gu2021SubwaysAR,
  title={Subways and Road Congestion},
  author={Yizhen Gu and Chang Jiang and Junfu Zhang and Ben Zou},
  journal={American Economic Journal: Applied Economics},
  year={2021},
  volume={13},
  pages={83-115}
}
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… 
Causal association between metro transits and air quality: China’s evidence
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  • Environmental Science
    Environmental Science and Pollution Research
  • 2022
In policy remedies, transportation infrastructure such as metro transit is widely considered to be an important and effective means to reduce air pollution. However, the policy prediction that metro
Home Location Choices and the Gender Commute Gap
Using administrative records of home mortgages in Beijing, we show that dual-income households systematically choose to buy homes that are closer to the wife’s workplace. The wife’s commute from the