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Posts by David Zipper

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'Hard to break the habit': Why free public transport isn't enough to shift from cars Free public transport is a popular policy, but researchers say it's not enough to convince drivers to leave the car at home.

From Australia:

"New research has found public transport fares have not been a decisive factor in pushing people to shift from car to public transport."

"Better public transport access, coverage, reliability, and travel time have a greater impact than price in changing long-term commuting habits."

28 minutes ago 20 0 2 1
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They are talking like traffic engineers haven't been trying - and failing - to fix traffic congestion for the last 70+ years

It's the wrong question to ask

And a good part of the reason we're in the mess that we're in

18 hours ago 431 57 77 164
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Is USDOT launching a national congestion pricing program?

If not, any campaign to “eliminate traffic bottlenecks across America” is doomed to fail.

18 hours ago 68 2 5 7
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The Psychological Traps That Keep Us Stuck Commuting Via Car Even when better options are available, switching modes is tough.

Behavioral science has a lot to teach us about transportation.

Here’s a related story I wrote a couple years ago.

20 hours ago 14 3 1 0
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What If Cities Onboarded Residents Like Employers Onboard Employees? Authored by Aaron Hurst, Founder and CEO of the US Chamber of Connection I have hosted dozens of dinners in my home in Seattle over the past few years, bringing together people across backgrounds and…

A simple way to expand toward transit/biking trips in your city: Offer new arrivals a welcome package including a transit pass and free bikeshare trips. 

These are the moments when people form new travel habits, so it's a great time for nudges!

20 hours ago 93 21 5 5
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Shoutout to RPA's Rachel Weinberger, @norton.bsky.social, and "Gridlock" Sam Schwartz for a fantastic discussion courtesy of Hunter College's urban planning program.

My takeaways ⤵️
www.linkedin.com/posts/david-...

22 hours ago 7 1 1 0
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'A Solution, But To What Problem?' Experts Say AVs Are The Elephant In The Room, But There's Still Time To Figure Out Their Role - Streetsblog New York City Want to know more about autonomous vehicles? Join us at "The Future of Transportation" seminar held last week at the Roosevelt House Public Policy Institute at Hunter College.

Last week I joined a spicy panel asking whether/how AVs fit into NYC. Here's a summary.

Me: "It’s just too inefficient to have individuals inside a big box of a car. I don’t care how it’s operated. That’s just not how what you scale to make New York City a faster, more-efficient and safer place."

23 hours ago 81 12 3 1

Interesting discussion starting around 38:40 about the impact of liability laws on safety

"In most European jurisdictions, an injured cyclist does not need to establish fault on the part of the motorist" www.slatergordon.co.uk/newsroom/cyc...

But in the Anglosphere, presumed liability is rare

4 days ago 13 3 1 0
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️Live Podcast Recording + Rooftop Fundraiser: Look Both Ways in Denver Come for the ideas. Stay for the views. Leave with a fresh perspective on Denver's streets.

Hey Denver—let's get drinks and nerd out on transportation!

This Tuesday, join @wesmars.bsky.social, @jlocantore.bsky.social, and yours truly for a reception + live recording of @lookbothwayspod.bsky.social.

All proceeds support Denver Streets Partnership.

1 day ago 6 1 0 1

I have not. And that doesn't seem like a ringing endorsement.

What I really want is another Winds of Change. I was absolutely obsessed with that one.

2 days ago 1 0 1 0

Looks like Waymos are now driving past stopped school buses in Nashville, as well as in Austin and Atlanta.

This has been happening for months, and it's been generating a ton of bad publicity. Waymo doesn't seem to know how to fix it.

2 days ago 118 44 8 4

OK, I clearly need to be asking you for recs, and not the other way around

2 days ago 1 0 1 0
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The Big Dig History Podcast · Series · There is a cynicism that hangs over the topic of American infrastructure – whether it’s high-speed rail or off-shore wind – it feels like this country can’t build big things...

One more attempt (and an all-time favorite): podcasts.apple.com/us/podcast/t...

2 days ago 0 0 1 0
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Slow Burn History Podcast · Monthly Series · Slow Burn illuminates America’s most consequential moments, making sense of the past to better understand the present. Through archival tape and first-person intervi...

Ok I’ll try again: Slow Burn season 4, about David Duke. Dark but sooo absorbing.

2 days ago 1 0 2 0
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Divine Providence Podcast Episode · Crimetown · S1 E1 · 34m

Crimetown!

2 days ago 1 0 1 0
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"all textbooks placed a greater emphasis on accommodating demand rather than managing it"

This feels like a version of Upton Sinclair's idea that "It is difficult to get a man to understand something when his salary depends upon his not understanding it"

3 days ago 54 8 7 0
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Tomorrow's engineers aren't learning about induced demand.

"3 [of 7] textbooks omitted the idea entirely, whereas the others offered only partial coverage."

"The engineering textbooks reviewed here leave students unprepared to understand induced travel."

journals.sagepub.com/doi/full/10....

3 days ago 142 30 6 22
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My most frigid NYC take is that Central Park is a masterpiece that reveals something new every time you visit

3 days ago 42 2 1 2
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Despite the hype around Paris's investments in bike infrastructure for the 2024 Olympics, new research finds that they "failed to maintain usage or drive behavioral shifts, confirming their role as temporary event solutions rather than transformative urban mobility assets."

doi.org/10.1016/j.tr...

3 days ago 20 4 1 0
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‘A clear setback’: More drivers speeding in Ottawa with photo radar gone, city says - Ottawa | Globalnews.ca The City of Ottawa says more drivers are speeding in school zones five months after the Ontario government shut off automated speed enforcement (ASE) cameras.

Three months after Ottawa removed its automatic safety cameras, the share of drivers following the speed limit plunged from 87% to 41%(!). "High-end speeding" is up 10x.

Automatic enforcement saves lives. If you remove it, people will die.

4 days ago 217 91 5 10
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Episode 12: The End of Year Extravaganza! End of Year Extravaganza – David & Wes toss the usual format aside to look back at the transportation stories that defined 2025. From policies and headlines that ma…

Not to be That Guy, but on this EOY podcast episode I named More and More More as the 2025 book I most hoped listeners read

5 days ago 1 1 1 0

Strong agree

5 days ago 0 0 1 0
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A snippet from the new episode, out later this week:

What happens when car companies exaggerate what their driver assistance systems can do?

Misled consumers take dangerous risks, assuming their car will keep them safe.

NHTSA and the FTC never should’ve allowed this to happen.

5 days ago 9 2 0 0
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New drive-thrus, service stations banned along some major Spokane arterials, paving way for bus-centric development New drive-thrus, gas stations, car washes and other service stations cannot be built in large swaths of Spokane for a year.

Kudos to Spokane. Neighborhoods can have drive-thrus or walkability—not both.

5 days ago 78 11 4 4

Not an easy read, but an enlightening one!

5 days ago 0 0 1 0
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Don't overlook:
- Crossings by @bengoldfarb.bsky.social
- Fighting Traffic by @norton.bsky.social
- Killed by a Traffic Engineer by @wesmars.bsky.social

yaleclimateconnections.org/2026/04/the-...

5 days ago 28 6 3 1

This is a perfect summation of why the constant finger wagging and victim blaming infuriates me. We simply shouldn't have a road system where pedestrians can so easily get killed. Individual choices will *never* make up for systemic flaws.

6 days ago 99 27 1 1

This ain’t it, boss

6 days ago 7 0 1 0

This is a big problem. Lumping together deaths among peds/cyclists and car occupants obscures the extent to which the US fails to protect people outside of cars.

Congress & safety advocates should push NHTSA to stop doing it.

6 days ago 61 20 1 1

If you're in Denver next Tuesday morning, this will be a fun one!

6 days ago 11 1 0 0
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