Chart of the Day: Lyft/Uber vs. DUIs (in S.F.)

This is information from San Francisco charting the implementation of the alternative taxi services with DUI rates. Something to think about when pondering similar changes in cities across the country.

[via Washington Post.]

DUI san fran

9 thoughts on “Chart of the Day: Lyft/Uber vs. DUIs (in S.F.)

  1. Reuben CollinsReuben Collins

    This may say more about changing levels of enforcement efforts over time than anything else. DUI arrests is probably somewhat independent from the number of people engaging in impaired driving?

    1. Alex CecchiniAlex Cecchini

      Good point. Also, the levels are just reaching pre-2009 ones where there was a spike. A longer reaching chart might show how variable the arrests are over time, but I’m interested to see what other events cause spikes/dips. For example, the spike/drop here seems to correlate pretty well with the recession.

      This is not to say better access to cabs (in any form), transit, etc won’t help drunk driving rates, just that the data here is murky.

      1. Steve Goose

        If the police enforcement tactics have no effect over the long term (which I doubt they do), and some percentage of people become unemployed, some percentage of those drink, and some percentage of those get caught, I think UE (see post below) could be a significant driver. During recessions rates of suicide increase significantly as well.

        What fun is you can see the dot com recession fading away as well as UE grinds lower in 04, which would have been huge in SF more so than other parts of the country.

  2. Steve Goose

    It might also just be that more people were drinking in general during the peak of the recession… that graph looks a lot like the unemployment graph for San Fran:

  3. Steve Goose

    I would also note a couple things:

    1) the drops in DUI occur prior to the implementation of the services in each case. And the drop is so large I would have a hard time thinking that instantaneously a critical mass of people started using the services, vs a gradual rise in users.

    2) There looks to be a strong seasonal component – with peaks happening mid year (summer) which would make sense, prob more people out drinking in the summer vs winter, even in SF.

    3) If the services explain the decrease, what explains the increases in 08/09?

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