David Zipper
@davidzipper.bsky.social
23K followers 350 following 10K posts
Senior Fellow @ MIT Mobility Initiative & Contributing Writer @ Vox, focused on transport, cities and tech. Words in Atlantic, CityLab, WaPo, etc. https://linktr.ee/davidzipper Newsletter, speaking and advisory work: http://davidzipper.com
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davidzipper.bsky.social
A bit of news:

@wesmars.bsky.social & I are launching Look Both Ways, a new podcast where we’ll debate everything transportation – from street design to robotaxis to fare-free transit.

First episode will be recorded live on Thurs, July 17th at 6p ET.

Join us then (and subscribe) ⤵️

🧵
Look Both Ways Podcast: Episode 1
YouTube video by Look Both Ways with David & Wes
www.youtube.com
davidzipper.bsky.social
New @lookbothwayspod.bsky.social livestream today at 6p ET! Use the link below.

The recording will be available on podcast platforms later this week.
davidzipper.bsky.social
New @lookbothwayspod.bsky.social livestream on Tues at 6p ET!

On the agenda:
🔹 USDOT yanks transit funding
🔹 Amish e-bikes (it's a thing!)
🔹 Why new US buses cost $$$

This will be the last livestream for a bit b/c @wesmars.bsky.social & I are heading abroad. Join us ⤵️, or listen later
Look Both Ways LIVE with David & Wes: Episode 7
YouTube video by Look Both Ways with David & Wes
www.youtube.com
davidzipper.bsky.social
"Few microtransit evaluations found that programs substantially increased transit ridership."

doi.org/10.1016/j.ci...
davidzipper.bsky.social
On @npr.org's Think podcast, I explained why ubiquitous robotaxis would create crushing gridlock:

"Human beings respond to an experience that gets better by doing more of it ... At scale, that means [you] have many, many more trips being taken by car on our roads and on our streets."
The bumps in the road facing self-driving cars - Think
Transportation expert David Zipper joins host Krys Boyd to discuss the benefits and drawbacks of autonomous vehicles.
think.kera.org
davidzipper.bsky.social
Seems bad:

"Urban highways are associated with decreased social connectivity."

"This barrier effect [is] consistent with historical cases of highways that were built to purposefully disrupt or isolate Black neighborhoods."

doi.org/10.1073/pnas...
Reposted by David Zipper
sambir.bsky.social
The thing you notice in Yellowknife is that residents, whom, unlike most Canadians, have serious winters, predominantly drive normal CARS year-round. Capable & suitable.
In summer, they demonstrate that it's perfectly normal & practical to strap a 17' canoe to the roof a 14' car.
davidzipper.bsky.social
You might think that the mayor of Yellowknife, the capital of Canada's vast Northwest Territories, would be a fan of giant pickups.

Nope. He's disgusted by car bloat.

www.linkedin.com/posts/benjam...
davidzipper.bsky.social
"Over half of the e-cargo bike mileage ridden during trials substituted for car use."

doi.org/10.1016/j.jc...
davidzipper.bsky.social
New @lookbothwayspod.bsky.social livestream on Tues at 6p ET!

On the agenda:
🔹 USDOT yanks transit funding
🔹 Amish e-bikes (it's a thing!)
🔹 Why new US buses cost $$$

This will be the last livestream for a bit b/c @wesmars.bsky.social & I are heading abroad. Join us ⤵️, or listen later
Look Both Ways LIVE with David & Wes: Episode 7
YouTube video by Look Both Ways with David & Wes
www.youtube.com
davidzipper.bsky.social
Not mentioned in the story:
🔹 The biggest danger for scooter riders is cars
🔹 Unlike cars, scooters almost never kill another person walking/biking/scooting

As I said to someone complaining about "dangerous" scooters, "You get hit by a car, and I'll get hit by a scooter. Let's see who feels worse."
Are e-scooters a safety nightmare? A new study looks at the data.
Many cities have moved to ban or restrict electric scooter rentals. But a new study finds that e-scooters tend to be safer than e-bikes in European cities.
www.washingtonpost.com
davidzipper.bsky.social
The Ontario premier either doesn't understand that speed cameras save lives, or he doesn't care.
davidzipper.bsky.social
A great way to keep kids safe: Place automatic traffic cameras near schools.

After cameras were installed in Toronto:
🔹 Share of vehicles speeding ⬇️ 45%
🔹 85th percentile speed ⬇️ 10.7 km/h

Droivers speeding the most were most likely to slow down.

injuryprevention.bmj.com/content/inju...
davidzipper.bsky.social
Nothing to sell, but I do cohost a podcast where @wesmars.bsky.social and I wonk out on all kinds of transportation topics — including car car bloat.

Check it out: lookbothwayspod.podbean.com
davidzipper.bsky.social
You might think that the mayor of Yellowknife, the capital of Canada's vast Northwest Territories, would be a fan of giant pickups.

Nope. He's disgusted by car bloat.

www.linkedin.com/posts/benjam...
Reposted by David Zipper
lookbothwayspod.bsky.social
A listener in Finland asks: Is Vision Zero a process or a goal?

@wesmars.bsky.social: It's both.
@davidzipper.bsky.social: No, it's entirely a process.
davidzipper.bsky.social
Note: A Montreal leader told me he convinced many car owners to support weight-based parking fees by explaining how the length of SUVs/pickups reduces street parking capacity.

Car bloat is bad for everyone – including other car owners!
Meet the Montreal Mayor Who Declared War on SUVs
Oversized vehicles are devouring street parking spaces in the Canadian city. So one borough’s mayor is fighting back with bigger fees for hefty trucks and SUVs.
www.bloomberg.com
Reposted by David Zipper
maustermuhle.bsky.social
For as much as some members of Congress say the D.C. government is dysfunctional and should be disbanded, it's worth noting that the D.C. government will open and operate normally tomorrow because elected officials can do stuff like, you know, pass annual budgets.
Reposted by David Zipper
lookbothwayspod.bsky.social
Why has Mobility-as-a-Service flopped?

"There's no evidence I could find anywhere that these MaaS apps were changing how people travel or reducing driving. And I asked everyone, for years." [email protected]
davidzipper.bsky.social
A few hundred robotaxis in a city are a fun novelty, but hundreds of thousands would bring urban life to a crashing halt.

From the latest episode of @lookbothwayspod.bsky.social
davidzipper.bsky.social
Big transit systems should make it easier for low-income residents to qualify for free or reduced-price rides. Good suggestions here.

Progressives should focus on ideas like these, rather than trying to drop fares entirely (which would be fiscally irresponsible, among other problems).
Free and low-fare transit programs fail to reach many in need: report
More outreach programs and automatic enrollment could make these programs accessible to more people, says a report from the Regional Plan Association, a New York nonprofit.
www.smartcitiesdive.com
Reposted by David Zipper
streetfilms.bsky.social
Very exciting! The seminal 1980 documentary "The Social Life of Small Urban Spaces" by William H. "Holly" Whyte has been RESTORED and screening in NYC this week!

I wanted to honor his work and used his words in the companion book and produced this 11 years ago.
www.youtube.com/watch?v=sU2v...
William “Holly” Whyte in His Own Words, “The Social Life of Small Urban Spaces” (1980)
YouTube video by Streetfilms®
www.youtube.com
davidzipper.bsky.social
New NBER paper on traffic noise:

🔹 Highway noise barriers increase adjecent property values by 6.8%
🔹 Traffic noise in the US imposes annual costs of $110 billion, largely in low-income/minority neighborhoods

www.nber.org/papers/w3429...