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4.6.0-nightly.2026-03-12
Senior Fellow at the MIT Mobility Initiative and Contributing Writer at Vox, focused on mobility, cities & tech. Words in CityLab, Slate, The Atlantic etc. Tweets: @davidzipper@mastodon.social #transportation #cities #innovation #technology #transit #cars #cycling #trafficsafety
Senior Fellow at the MIT Mobility Initiative and Contributing Writer at Vox, focused on mobility, cities & tech. Words in CityLab, Slate, The Atlantic etc. Tweets: @ davidzipper #transportation # cities # innovation # technology # transit # cars # cycling # trafficsafety
Senior Fellow at the MIT Mobility Initiative and Contributing Writer at Vox, focused on mobility, cities & tech. Words in CityLab, Slate, The Atlantic etc. Tweets: @ davidzipper #transportation # cities # innovation # technology # transit # cars # cycling # trafficsafety
Americans drive a lot more than people in other rich countries.
If we didn’t drive so much, we wouldn’t die in so many crashes.
It’s a simple point, but one that NHTSA, traffic engineers, and many road safety org’s have yet to learn.
Me, in Bloomberg
Senior Fellow at the MIT Mobility Initiative and Contributing Writer at Vox, focused on mobility, cities & tech. Words in CityLab, Slate, The Atlantic etc. Tweets: @ davidzipper #transportation # cities # innovation # technology # transit # cars # cycling # trafficsafety
Senior Fellow at the MIT Mobility Initiative and Contributing Writer at Vox, focused on mobility, cities & tech. Words in CityLab, Slate, The Atlantic etc. Tweets: @ davidzipper #transportation # cities # innovation # technology # transit # cars # cycling # trafficsafety
Hey guys, I’m writing a book!
THE PRICE OF TRAFFIC will tell the story of congestion pricing, one of the best – and most controversial—policy ideas of the last half century. It will be published with MIT Press in partnership with Penguin Random House.
Know a great story about congestion pricing that needs to be told? An illuminating study that deserves more attention? A person with an inside angle on what went down in Singapore, London, Milan or NYC? Message me!
Senior Fellow at the MIT Mobility Initiative and Contributing Writer at Vox, focused on mobility, cities & tech. Words in CityLab, Slate, The Atlantic etc. Tweets: @ davidzipper #transportation # cities # innovation # technology # transit # cars # cycling # trafficsafety
Senior Fellow at the MIT Mobility Initiative and Contributing Writer at Vox, focused on mobility, cities & tech. Words in CityLab, Slate, The Atlantic etc. Tweets: @ davidzipper #transportation # cities # innovation # technology # transit # cars # cycling # trafficsafety
The research is clear: Cities have many reliable ways to curtail speeding.
Lower the speed limit. Deploy traffic cameras. Insert speed humps. Install road diets.
They all work – and most residents support them.
But implementation often feels like pulling teeth. In Bloomberg, I explored why.
https://www.bloomberg.com/news/articles/2026-02-10/how-cities-can-win-the-war-on-speeding-drivers