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dave
@daveliepmann.com
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daveliepmann.com
dave @daveliepmann.com · Nov 21
Photos on my phone tagged “cycling with kids propaganda”

- girls huddling under a blanket together on the way home from the park
- hauling girls to a birthday party (with their bike)
- wandering around the city with the toddler
Man in summer clothes riding cargo bike with two girls in the bucket Woman riding cargo bike with two girls in the bucket Man straddling his bike, kissing baby in the front seat
Reposted by dave
fogus.me
This!
Upgrading versions of Clojure is a breeze!
November 16, 2025 at 7:48 PM
Reposted by dave
misernyc.bsky.social
As I've said, I actually support the limits on micromobility, but they have to be paired with ones that are the same or slower for cars. I've long called for 20 across the board on anything that moves in NYC. A system that vilifies ebikes and suggests we're more dangerous than cars is insane.
October 22, 2025 at 1:11 PM
Reposted by dave
danieltrubman.bsky.social
Planning a transit trip from Manhattan to North Jersey tomorrow, and we're going to need to pay 3 separate agencies 3 separate fares 3 separate times and boy that doesn't seem efficient for anyone?

Doing this much homework on how to buy tickets shouldn't be necessary!
October 19, 2025 at 12:16 AM
Reposted by dave
dingdingpeng.the100.ci
I laughed about Huel being “spiritually bad.” I also wish one could just trust media outlets that break news about supposedly troubling contamination to not lean into the story at the cost of scientific accuracy.
Huel is Fine
Breaking down the issues with Consumer Reports' investigative reporting on lead levels in protein supplements
thebsdetector.substack.com
October 17, 2025 at 4:00 AM
daveliepmann.com
Any sufficiently useful Todo system contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of org-mode.
October 17, 2025 at 8:05 AM
daveliepmann.com
New favorite bike share stress test
willnorman.co.uk Will Norman @willnorman.co.uk · Oct 15
London is proud to host Japan's Grand Sumo Tournament this week - it's fantastic to see the the teams using our cycling infrastructure to get around.
October 15, 2025 at 12:18 PM
daveliepmann.com
Inclusionary Zoning, but *fully funded* by a tax on SFHs and low-density land use (read: parking lots)
October 15, 2025 at 11:18 AM
daveliepmann.com
CDU leading the city precisely backwards

www.tagesspiegel.de/berlin/fahrg...
Fahrgäste sollen Baukosten tragen: CDU plant Zugangskontrollen an allen Berliner U-Bahnhöfen – so reagiert die BVG
Um die U-Bahnhöfe sauberer und sicherer zu machen, will die CDU-Fraktion an allen Eingängen Drehkreuze einbauen. Die Kosten von 400 Millionen Euro sollen auf die Tickets umgelegt werden.
www.tagesspiegel.de
October 13, 2025 at 5:23 PM
daveliepmann.com
...how do we get 27 transport authorities out of 16 Bundesländer?
trenvistaen.bsky.social Trenvista in English @trenvistaen.bsky.social · Oct 13
Germany aims to reunify the procurement of PSO trains in order to make their acquisition and maintenance easier and cheaper. The model is based on that of the VDV Tram-Train consortium.
Germany's 27 states join forces to make joint train purchases
Since regionalisation, purchasing has become fragmented, losing the benefits of economies of scale.
www.trenvista.net
October 13, 2025 at 4:47 PM
daveliepmann.com
Nöööööööööööööö 😢
heisebahn.bsky.social heisebahn @heisebahn.bsky.social · Oct 9
Der SJ-EN Berlin - Stockholm wird auf Ende August 2026 eingestellt, vermelden DSO und Postvagnen. Später am Abend kommt ein Artikel auf jarnvagar.nu. Das werte ich als Bestätigung.

@sebwilken.net
@jon.gruene.social.ap.brid.gy
October 9, 2025 at 6:21 PM
daveliepmann.com
Carry Shit Olympics: a two-parter

This enormous house plant needed to go from Neukölln to Mitte. My first attempt failed: my Muli’s front bucket couldn’t stabilize it, and visibility was not good. I stopped off in Kreuzberg to regroup.
October 9, 2025 at 1:17 PM
daveliepmann.com
The school, the parents' association, and safe streets advocates all warned the city. But CDU prefers kids get run over. Manja Schreiner has blood on her hands.
October 8, 2025 at 7:35 AM
Reposted by dave
fussverkehr.bsky.social
Hier alles, was Menschen in Berlin schon vorher über die Moral von @senmvku.bsky.social Ute Bonde und ihren Erfüllungsgehilfen wussten www.tagesspiegel.de/berlin/bezir...
Kind vor Schule in Berlin angefahren: Eltern hatten vor Unfallgefahr gewarnt – doch Senat wollte Verkehr „flüssig halten“
Seit der A100-Eröffnung sind vor einer Schule in Friedrichshain deutlich mehr Autos unterwegs. Eltern hatten schon vorher vor der Kreuzung gewarnt – die Verkehrsverwaltung sah keine Gefahr.
www.tagesspiegel.de
October 7, 2025 at 7:13 PM
Reposted by dave
mbonsma.bsky.social
My great aunt is in her 80s and lives in a Vancouver apartment. She doesn't drive anymore, too painful for her back, but she walks every day. Her walker fits a shopping basket perfectly on the seat, so she takes the bus to the store and then walks home with her groceries.
October 2, 2025 at 1:57 PM
Reposted by dave
paulbarter.bsky.social
"The Insane Price We Pay for Underground Car Parking in Copenhagen".

Short video by @colville-andersen.com

www.youtube.com/shorts/o9iCW...
cc @sorenhave.dk
The Insane Price We Pay for Underground Car Parking in Copenhagen
YouTube video by Coolville feat.:The Life-Sized City
www.youtube.com
September 30, 2025 at 9:00 AM
daveliepmann.com
California has the longest light-rail line in the world. It doesn’t quite work.

www.sfchronicle.com/opinion/open...
The A Line’s purpose is to get us out of our cars. But its stations’ designers can’t imagine a life without cars, or can’t correctly calculate the demand for “park and ride.” Many stations are bordered or surrounded by large, empty parking lots, occupying too much space where new, transit-friendly development should be.
September 29, 2025 at 10:28 AM
daveliepmann.com
Medical science just keeps racking up Ws. Humanity is vanquishing our ancient foes one by one.

www.bbc.com/news/article...
Huntington's disease successfully treated for first time
One of the most devastating diseases finally has a treatment that can slow its progression and transform lives, tearful doctors tell BBC.
www.bbc.com
September 24, 2025 at 1:11 PM
daveliepmann.com
Today we laid Stolperstein for my distant cousins’ great-uncle and his second wife.

I like the manual process of Stolpersteinverlegung. They kneel down close and get in there with custom hand tools. Takes maybe ten minutes, just the right amount of time for a speech.
September 23, 2025 at 1:53 PM
daveliepmann.com
“Theophilus, you dog, don’t perform oral sex on girls against the city wall!”

via www.reddit.com/r/AskHistori...
Tiopilus canis, cunnu(m) lingere noli puellis in muro
September 23, 2025 at 8:11 AM
daveliepmann.com
Check out Fujinokawa x Roga on day 7 of the current basho.

Timestamp 8:44
youtu.be/TjlfW1nCZCM?...
youtu.be
September 22, 2025 at 5:24 PM
daveliepmann.com
"A true pacifist is able to kill or maim in the blink of an eye, but at the moment of impending destruction of the enemy he chooses non-violence. He chooses peace. He must be able to make a choice."
–Yukiyoshi Takamura

aikidojournal.com/2012/06/11/i...
Shindo Yoshin Ryu: “Interview with Yukiyoshi Takamura,” by Stanley Pranin, Marco Ruiz and David Maynard – Aikido Journal
aikidojournal.com
September 19, 2025 at 12:09 PM
daveliepmann.com
"Streets before trust" versus "trust before streets"

"Low-trust people notice results... Build the streets and trust will follow."

pedestrianobservations.com/2020/12/31/s...
What is trust before streets? The trust before streets mentality, as currently used, means that the state has to first of all establish buy-in before doing anything. Concretely, if the goal is to make the streets safer for pedestrians, the state must not just build a pop-up bike lane or a pedestrian plaza overnight, the way Janette Sadik-Khan did in New York, because that is insensitive to area residents. Instead, it must conduct extensive public outreach to meet people where they’re at, which involves selling the idea to intermediaries first.
September 17, 2025 at 7:42 AM
Reposted by dave
rivikah.bsky.social
It's the time of year where I dream about making the street in front of my kid's school car free.
September 16, 2025 at 3:07 PM
daveliepmann.com
A fun little effect system in a proglang sharing a name with the least possible score in judo

koka-lang.github.io/koka/doc/boo...
2.2. Effect Typing Koka infers and tracks the effect of every function in its type – and a function type has 3 parts: the argument types, the effect type, and the type of the result. For example: fun sqr : (int) -> total int // total: mathematical total function fun divide : (int,int) -> exn int // exn: may raise an exception (partial) fun turing : (tape) -> div int // div: may not terminate (diverge) fun print : (string) -> console () // console: may write to the console fun rand : () -> ndet int // ndet: non-deterministic The precise effect typing gives Koka rock-solid semantics and deep safety guarantees backed by well-studied category theory, which makes Koka particularly easy to reason about for both humans and compilers. (Given the importance of effect typing, the name Koka was derived from the Japanese word for effective (効果, こうか, Kōka)).
September 15, 2025 at 5:57 PM
Reposted by dave
nysfocus.bsky.social
These files show how some departments have treated drunk driving as an H.R. issue, not a crime.

Read the full investigation by @sammysussman.bsky.social for New York Focus and @nytimes.com.
‘No Arrests’: In New York, Some Police Can Drink, Drive and Avoid…
Officers in New York State crashed their official vehicles, hit other motorists and arrived to work reeking of alcohol. And yet, they sometimes evaded…
nysfocus.com
September 9, 2025 at 2:27 PM