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Subways and Road Congestion

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  • Yizhen Gu
  • Chang Jiang
  • Junfu Zhang
  • Ben Zou

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.

Suggested Citation

  • Yizhen Gu & Chang Jiang & Junfu Zhang & Ben Zou, 2021. "Subways and Road Congestion," American Economic Journal: Applied Economics, American Economic Association, vol. 13(2), pages 83-115, April.
    • Handle: RePEc:aea:aejapp:v:13:y:2021:i:2:p:83-115
    DOI: 10.1257/app.20190024
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    7. Li, Tianshu & Song, Shunfeng & Yang, Yanmin, 2022. "Driving restrictions, traffic speeds and carbon emissions: Evidence from high-frequency data," China Economic Review, Elsevier, vol. 74(C).
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    9. Jindong Pang & Shulin Shen, 2023. "Do ridesharing services cause traffic congestion?," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 56(2), pages 520-552, May.
    10. Ioulia V Ossokina & Jos van Ommeren & Henk van Mourik, 2023. "Do highway widenings reduce congestion?," Review of Finance, European Finance Association, vol. 23(4), pages 871-900.
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    More about this item

    JEL classification:

    • O18 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Urban, Rural, Regional, and Transportation Analysis; Housing; Infrastructure
    • P25 - Political Economy and Comparative Economic Systems - - Socialist and Transition Economies - - - Urban, Rural, and Regional Economics
    • R41 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - Transportation Economics - - - Transportation: Demand, Supply, and Congestion; Travel Time; Safety and Accidents; Transportation Noise

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    1. Subways and Road Congestion (American Economic Journal: Applied Economics 2021) in ReplicationWiki

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