How highways make traffic worse

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Published 2021-02-12
Expanding highways doesn't do what you think it does.

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Big, expensive highway expansion projects are the source of a lot US transportation funding — but they aren't a silver bullet for congestion relief. In communities that were built for cars, solving traffic problems requires much more holistic problem-solving.

At 1:00, we show a bar graph of travel times on the Katy Freeway that was originally put together by City Observatory, which has covered the Katy Freeway expansion project at length:
cityobservatory.org/reducing-congestion-katy-didnt…

This video was based in large part on research by Gilles Duranton and Matthew A. Turner:
www.aeaweb.org/articles?id=10.1257/aer.101.6.2616

For more reading on induced demand:
www.wired.com/2014/06/wuwt-traffic-induced-demand/

www.bloomberg.com/news/articles/2018-09-06/traffic…

For Kyle Shelton's work on urbanism:
kinder.rice.edu/urban-edge/author/541

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All Comments (21)
  • @Vox
    Correction: At 5:12, we use Boston as an example of a successful urban highway removal project that resulted in congestion-reduction. Many of you correctly pointed out that this example isn’t quite right, because they moved several highway lanes underground. You can read more about that project here: www.bostonglobe.com/magazine/2015/12/29/years-late… When it comes to congestion-reduction, highway removal projects are inherently complicated, but here is more information about some of the environmental and racial justice impacts of a proposed federal plan to remove urban highways: www.bloomberg.com/news/articles/2021-02-01/urban-h…
  • What I don't get is how much of a fight some Americans put up when there area wants to put in some new buses or light trains. Like, isn't it neat to just pay a few $ and get into the centre of a town without having to pay parking?
  • @probablyaman
    So building more highway lanes is like opening more tabs on Google Chrome....
  • @krystofdayne
    Like the guy from "Not just Bikes" said: People always talk about wanting to have the freedom to drive. But what about the freedom to not have to drive?
  • “Adding car lanes to deal with traffic congestion is like loosening your belt to cure obesity." — Lewis Mumford, 1955 Edit: Cool, thanks for the likes! :D Greetings from Cologne, Germany - where a 6 lane highway Bridge is being replaced by a 12 lane bridge 🤦‍♂️
  • @mazco3336
    Me, an intellectual who have played Cities Skylines: Yes, I understand traffic
  • @redunicorn7760
    Imagine how much better it would be if they created a train network
  • @KyrieFortune
    Ah yes, the residential-commercial mixed zones. Or, as the rest of the world calls it, how towns have been built since the advent of agriculture.
  • @daviddima6067
    Houston: the highway is really congested Biffa cities skylines: hold my tea
  • @rom7633
    One of the biggest cons ever was selling the American Dream as living 1 hour commute from work, where you can't walk to any store, can't go outside cause of dangerous pedestrian paths, & "freedom" means requiring an expensive car (insurance/maintenance) to go anywhere with no public transportation access or even sidewalks
  • @GeeklingNo1
    As someone who can't drive, the car-centric society in America is very hard for me and others like me. Now that I'm loosing my vision I'm now to ask my mom if i can go to a friend's house bc I can't go if she won't. I'm in my 20s asking my mom to drive me places like a child again. It's rather humiliating for those who start losing their vision.
  • Shanghai, Hong Kong, London, Paris, and Taipei's subway system changed my mind about public transit. I used to think that car ownership is the only way to go. Technically it still is in the US. But I can't imagine driving in those cities
  • @AwesomeBoysJPTV
    "Because, if we build it, they will come." One sentence that answers the whole Question of the Video
  • @Healtsome
    Simple. Just remove all the roads and you won't have any traffic.
  • @gino14
    The Katy Freeway is the largest Freeway on Earth, spanning twenty-six lanes each way and costing Texas 2.3 billion dollars to build and 8 million dollars a year to maintain. It still jams.
  • @AaronShenghao
    Astronaut: Huston, we have a problem. NASA: What you blew an engine? Astronaut: No... The traffic jam is visible from Space!
  • @Eldelastrufas
    Me, a Colombian who only knows “highways” with 4 lanes at most and are congested 24/7, watching this video: interesting
  • @OscarBorrem
    Civil Engineer: Spends most of his life trying to figure out how the road is should be constructed to reduce congestion Average Cities Skylines player: I'll just remove all traffic lights, and they'll figure it out