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David Zipper

@davidzipper.bsky.social
26K followers 422 following 11K posts

Thinking, writing, and speaking about transport, cities, and tech. Contributing Writer @ Bloomberg and cohost @ Look Both Ways w/David & Wes. Working on a book about congestion pricing. linktr.ee/davidzipper Newsletter & contact info: www.davidzipper.com

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David Zipper @davidzipper.bsky.social · 8h
Austria has banned mopeds and e-mopeds from using bike lanes. Makes sense. It's not safe for families with children to share bike lane with couriers traveling at speeds 5x faster. www.bmimi.gv.at/en/service/p...
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David Zipper @davidzipper.bsky.social · 29/09/2026
"E-bike adopters reduced travel costs by 12% and increased physical activity by 14%." doi.org/10.1016/j.ur...
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David Zipper @davidzipper.bsky.social · 29/09/2026
Translation: Georgians who use a car little or not at all will subsidize heavy drivers even more than they already are.
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David Zipper @davidzipper.bsky.social · 27/09/2026
I often see misleading stuff like this (from LinkedIn). Reminder: The price of a robotaxi trip reveals nothing about efficiciency or economics. It's hugely subsidized. Remember how cheap Uber and Lyft were a decade ago, back when they were private companies spending investor dollars?
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David Zipper @davidzipper.bsky.social · 27/09/2026
Hyper-fast acceleration is dangerous as well as pointless. As I wrote in 2024, the 0-to-60 metric is outdated and needs to die. No driver on a public road needs to go from 0 to 60 mph in under 8 seconds. Even the slowest car on the market is more than quick enough.
fastcompany.com
How fast can a car go from 0 to 60? It really doesn't matter
The auto industry has pushed this metric for decades. But cars—especially EVs—are so fast that comparing the decimals is pointless and dangerous.
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David Zipper @davidzipper.bsky.social · 27/09/2026
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David Zipper @davidzipper.bsky.social · 26/09/2026
Is Waymo really the "missing middle" of urban transportation? Or is that just Climate Week greenwashing? Looking forward to discussing with @wesmars.bsky.social
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David Zipper @davidzipper.bsky.social · 26/09/2026
I'm getting ready to visit London for the first time in a decade. Anything I should be sure to see/do/eat?
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David Zipper @davidzipper.bsky.social · 24/09/2026
Irony alert: NYC Climate Week features a session about "Reducing Driving As Climate Action" that's sponsored by Waymo, a company poised to massively expand car use luma.com/parking-70cz...
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David Zipper @davidzipper.bsky.social · 24/09/2026
I don't know enough about the BQE debacle to have a strong opinion about it, but I appreciate that NYCDOT's commissioner took the time to explain his decision to a skeptical audience. More transportation leaders should do this.
nyc.streetsblog.org
Opinion: The Toughest Choice Was The Only Choice On The BQE - Streetsblog New York City
People have lots of opinions about what should happen to the Brooklyn Queens Expressway, but the only opinion that matters is the one belonging to the Transportation commissioner. So here it is.
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David Zipper @davidzipper.bsky.social · 23/09/2026
​Waymo is all over NYC Climate Week, sponsoring a slew of events. I just watched Adam Lenz, Waymo's sustainability head, field softball questions from Heatmap's CEO (nothing re: added VMT). Waymo clearly hopes to piggyback on YIMBYism. Lenz described Waymo as the "missing middle" of city mobility.
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David Zipper @davidzipper.bsky.social · 23/09/2026
I am once again asking why, as a DC resident, my city should be eager to deploy robotaxis
ft.com
What to do when your Waymo holds up a Secret Service motorcade
Stranded in six-lane traffic, surrounded by agents, my autonomous vehicle refused to budge
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David Zipper @davidzipper.bsky.social · 23/09/2026
Remember the hype 15 years ago about ridehail being transit's first mile/last mile savior—which turned out be completely untrue? Waymo is dusting off the playbook. This is a PR move, nothing more.
theverge.com
Waymo is offering transit discounts again, this time with Visa
Waymo is doing transit discounts again.
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David Zipper @davidzipper.bsky.social · 21/09/2026
This story is from a couple weeks ago, but it could just as easily be from 2012
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David Zipper @davidzipper.bsky.social · 21/09/2026
Seems like a great reason to buy a brand new minicar or e-bike instead: From 2019 to 2026 “in the $15,000-$20,000 price range the average [used] vehicle age has climbed from 3.4 years to 6 years, while the average mileage has climbed from 41,851 to 71,192.”
edmunds.com
The Vanishing Affordable Used Car: 3-Year-Old Used Vehicle Prices Top $32K Average in Q2
Edmunds' Q2 2026 Used Vehicle Market Report finds that the average price of a 3-year-old used vehicle reached a record $32,461, while affordable used cars continue to disappear. Vehicles priced under ...
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David Zipper @davidzipper.bsky.social · 20/09/2026
Cathie Wood predicts robotaxis "are going to destroy the auto market." I doubt it. Surveys show that most people want to own an AV, not hail rides through a fleet. That makes sense: A robotaxi can't store your stuff for a few days or reinforce your identity with its design/color/stickers/etc.
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David Zipper @davidzipper.bsky.social · 19/09/2026
Headed to NYC for Climate Week? Join me at one of the only transportation sessions that *isn't* sponsored by Waymo! On Wed @3p, @jeffreytumlin.bsky.social, RPA's Rachel Weinberger, Swyft Cities' Jeral Poskey and I will discuss what AVs mean for climate. Hint: It's not great. Free to register ⤵️
luma.com
Will Autonomous Vehicles Improve the Environment? A Skeptical Conversation: Climate Week NYC · Luma
As cities rethink transportation in the face of climate change, autonomous vehicles are often presented as a promising part of the solution. But do they…
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David Zipper @davidzipper.bsky.social · 18/09/2026
A nightmare indeed. History shows that when transmit agencies slash service, riders leave—often for good. So many other US cities face similar catastrophes: Cleveland, Portland, Providence, Milwaukee…
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Jeffrey Tumlin 🏳️‍🌈 🌁 @jeffreytumlin.bsky.social · 10/09/2026
Join us at NYC Climate Week on Wed 9/23. AVs could be part of climate solution, but industry and regulators aren't yet pointed in that direction
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Look Both Ways with David & Wes @lookbothwayspod.bsky.social · 17/09/2026
New episode is live! 🔹 Which car ads do David & Wes like or loathe? 🔹 Why did both of them change their minds about the value of speed limits? 🔹 Can—let alone should— autonomous vehicles always obey traffic laws? All that and more. Have a listen ⤵️
lookbothwayspodcast.com
Episode 30: Speed Limits + Should Robotaxis Have to Follow the L…
Speed Limits - David & Wes talk about speed limits: what they can do, what they can’t do, and the surprisingly complicated question of how robotaxis should handle t…
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Look Both Ways with David & Wes @lookbothwayspod.bsky.social · 17/09/2026
Can lowering speed limits — and doing nothing else — actually reduce extreme speeding? @wesmars.bsky.social says yes.
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David Zipper @davidzipper.bsky.social · 16/09/2026
In this week's @lookbothwayspod.bsky.social, Wes asked which car ad I loathe most. Tough competition. I went with the Dodge Charger's salute to urban speeding, from the 2018 Super Bowl.
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Look Both Ways with David & Wes @lookbothwayspod.bsky.social · 16/09/2026
Human drivers constantly make context-specific choices when deciding whether to obey traffic laws like speed limits. But can an autonomous vehicle grasp the difference between heading to a friend's house and rushing to the hospital? From the new episode
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Marco Chitti @chittimarco.bsky.social · 15/09/2026
This incapacity to perceive vehicular travel demand as elastic, especially within the North American traffic planning practice, is reflected in the technical tools used to measure project impact: intesection-based LOS where the input level of traffic is a given rather than variable.
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David Zipper @davidzipper.bsky.social · 15/09/2026
Yet again, traffic engineers are gobsmacked that a road closure didn't create crippling gridlock: "You’d never know that a massive highway project, ominously dubbed 'carmageddon,' was underway seven miles away...cars [were] speeding across the Interstate Bridge at their usual clip."
opb.org
Vancouver traffic largely unaffected by start of I-5 Rose Quarter project
Washington transportation officials warn commute time could increase in the coming days.
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David Zipper @davidzipper.bsky.social · 15/09/2026
I have no sympathy for this guy, who is complaining about paying an extra $3 per toll b/c his Cybertruck weighs >8,000 lbs (and is therefore more damaging to asphalt). Plenty of EVs are smaller, lighter, and safer for other road users. No one made him buy a rolling behemoth.
rhodeislandcurrent.com
Cybertruck owners take a heavy toll on the Pell Bridge. And pay one too. • Rhode Island Current
A Cybertruck’s weight comes with a price on the Pell Bridge. One North Kingstown owner says he’s paying $4 per trip and wants Rhode Island to rethink how it tolls heavy electric vehicles.
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David Zipper @davidzipper.bsky.social · 15/09/2026
Hey Chicago! Now is the time to make sure you can replace street parking with bike lanes, loading zones, sidewalk expansions, and all the other great stuff streets can do when they’re not storing cars.
news.wttw.com
Deal Reached to Sell Chicago Parking Meters to Investment Firm, Alderpeople Say
The deal requires Stonepeak to sell Omni Air International, which has a contract with the Trump administration to carry out deportations, according to the City Council members.
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Lewis Lehe @lewislehe.bsky.social · 14/09/2026
I think more and more that @davidzipper.bsky.social got this exactly right. many counties experiencing population decline have high elderly populations. getting people to walmart or a small airport would be a big deal. www.bloomberg.com/news/article...
bloomberg.com
Robotaxis Aren’t Going Where They Are Needed Most
Waymo, Zoox and Tesla are clamoring to bring autonomous ride-hailing to cities like New York and Boston. But it’s small towns and rural areas that could see the biggest upside from AVs.
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Ken McLeod @kenmcld.bsky.social · 14/09/2026
Delay to pedestrian Automatic Emergency Braking (AEB) rule is now moving forward through the White House www.politico.com/newsletters/... Pedestrian AEB deployment was mentioned as a lifesaving technology in the admin's National Roadway Safety Strategy last month
Clip from Politico newsletter about pedestrian AEB
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David Zipper @davidzipper.bsky.social · 14/09/2026
Me, in @bloomberg.com : In Singapore, residents need to bid $100k+ for a 10-year "right" to own a car. Draconian? Maybe. But the country's Vehicle Quota System has ensured that transit—not cars— is the top travel mode. Gift link: www.bloomberg.com/news/article...
bloomberg.com
The Right To Buy a Car? In Singapore, It Will Cost You.
The city-state’s unique vehicle quota system has made it one of the world’s most expensive places to buy a new car. Here’s how it works — and why it’s unlikely to succeed elsewhere.
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David Zipper @davidzipper.bsky.social · 13/09/2026
This isn’t tough-on-crime; it’s stupid
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David Zipper @davidzipper.bsky.social · 13/09/2026
Tuesday at 6p ET
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David Zipper @davidzipper.bsky.social · 13/09/2026
PSA: An original penny farthing is on display at the MLK Library in downtown DC
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David Zipper @davidzipper.bsky.social · 11/09/2026
After 9/11, many Americans opted to drive instead of fly. But because plane travel is much safer than car travel, the shift led to a surge in crash deaths. Researchers have found that the number of lives lost (2,000+) is comparable to those killed on 9/11. www.tandfonline.com/doi/abs/10.1...
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David Zipper @davidzipper.bsky.social · 10/09/2026
Looking forward to this "skeptical conversation" about AVs + the environment during Climate Week NYC (9.23). I'll be a panelist alongside @jeffreytumlin.bsky.social, Rachel Weinberger (RPA), and Jeral Poskey (Swyft Cities). Free to attend if you register ⤵️
luma.com
Will Autonomous Vehicles Improve the Environment? A Skeptical Conversation: Climate Week NYC · Luma
As cities rethink transportation in the face of climate change, autonomous vehicles are often presented as a promising part of the solution. But do they…
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David Zipper @davidzipper.bsky.social · 10/09/2026
When Democrats reclaim power, they need to bring the hammer down—hard—on Tesla. We can't afford to normalize behavior like this. From Junko Yoshida's newsletter: junkoyoshidaparis.substack.com/p/nhtsa-scra...
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David Zipper @davidzipper.bsky.social · 10/09/2026
Looking forward to this tonight in downtown DC. I'm told it's sold out, but if you ask nicely they might be able to squeeze you in.
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David Zipper @davidzipper.bsky.social · 10/09/2026
New study finds the social cost of driving a car 1 km—including pollution, crashes, infrastructure, and noise—is more than *triple* the private cost paid by the car owner. doi.org/10.1016/j.tr...
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David Zipper @davidzipper.bsky.social · 09/09/2026
Going car-free is great, but don't forget about families who could use a cargo bike (or minicar) as their second or third vehicle. The potential market is much, much bigger!
electrek.co
This family of four put 1,000 km on a cargo e-bike instead of buying a second car
I’ve been working in the electric bike industry for nearly two decades, and publicly reviewing e-bikes for around half of...
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David Zipper @davidzipper.bsky.social · 09/09/2026
Hint: Autonomous vehicles have literally nothing to do with it
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David Zipper @davidzipper.bsky.social · 09/09/2026
Remarkable. In 2025, Japan had the lowest number of crash deaths on record (going back to 1948). Now they're poised to have even fewer.
theguardian.com
Japan halves speed limit to 30km/h on all narrow city streets
Speed limit dropped from 60km/h for around 70% of general roads in the hope of making narrow streets of crowded cities safer
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David Zipper @davidzipper.bsky.social · 08/09/2026
About to hit send on a new edition of my occasional newsletter, Paved with Good Intentions. Free to sign up: www.davidzipper.com/newsletter
davidzipper.com
Paved with Good Intentions — David Zipper
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David Zipper @davidzipper.bsky.social · 08/09/2026
Getting mixed signals about taking a Great American Road Trip
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David Zipper @davidzipper.bsky.social · 08/09/2026
Agree, and it’s not just Citi Bike. Every other mode is already subsidized. Why are we making bikeshare the exception?
fastcompany.com
Undoing bikeshare’s original sin
Bikeshare has been a godsend. Why not subsidize it?
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David Zipper @davidzipper.bsky.social · 07/09/2026
For the unfamiliar, Hains Point is is a picturesque waterfront park where residents cycle, jog, fish, or just hang out (years ago, I taught someone to ride a bike there). Now Trump wants to convert it into an expansive golf course. It's infuriating what he is doing to this city.
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jamelle @jamellebouie.net · 07/09/2026
anyway i think DC statehood is a non negotiable. only way to give DC residents the tools to protect themselves.
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Theo Gordon @theogordon.bsky.social · 07/09/2026
We call this, "going the full Robert Reich"
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David Zipper @davidzipper.bsky.social · 06/09/2026
Incredible
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David Zipper @davidzipper.bsky.social · 06/09/2026
Fresh evidence that car touchscreens are a giant step backwards for road safety: "For all tasks, the touchscreen was associated with increased visual distraction." doi.org/10.1016/j.tr...
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David Zipper @davidzipper.bsky.social · 06/09/2026
Many such cases. This person mentions the climate crisis in her bio.
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