Research Fellow @joinFAI; opinions mine not theirs | Working to make US transportation faster, cheaper, more reliable, & less safe | prev: Econ & CS @UChicago

Inside the Beltway, USA
Joined January 2022
Include

Only show posts containing:

Exclude

Hide posts containing:

Time range
-
Minimum likes
Lucas Pombo (aka Lib Development)
@Lib_Development2h
Replying to @eventidia
what would the opinion be here? it’s just statistics
25
Lucas Pombo (aka Lib Development)
@Lib_Development2h
... huh?
There is an (unpatchable?) supply-chain zero-day in PyTorch autograd that allows a regularization term to use the model's weights as RAM and SGD as its CPU clock to run any computation during training.
1
5
326
Lucas Pombo (aka Lib Development)
@Lib_Development3h
Replying to @JoeVeyera
It seems for the specific start & end combinations in question the station locations just like really suck
2
3
983
Lucas Pombo (aka Lib Development)
@Lib_Development3h
Replying to @sturmovikdragon
There was some dispute about whether 2AS should continue to the Bronx after 116th or if they should move the 2nd ave station but that side lost the argument I think
2
2
73
Lucas Pombo (aka Lib Development)
@Lib_Development3h
Not really very enthused about speed limits that you could reasonably violate on foot
We met up with cycling advocate and lawyer Steve Vaccaro in Central Park to hear about why he's helping with a legal battle to block NYC's proposed 15 mph speed limit along the Central Park Drives.
1
14
479
Lucas Pombo (aka Lib Development)
@Lib_Development3h
Replying to @atlanticesque
The actual reason is that extending a project for which the TBM is already in the ground is vastly easier than launching it again. If they wanted to come back and do this later it would be a lot of additional work, and this is a reasonable spot for a route graph-theoretically
1
20
318
Lucas Pombo (aka Lib Development) retweeted
Upzone New Jersey 🏗️@upzonenjOct 20
When I talk about Hoboken's land use being a disaster, this is what I have in mind. Yes, it's better than the suburbs, but this is not nearly dense enough that close to PATH. jerseydigs.com/425-newark-st…
10
3
44
4,987
Lucas Pombo (aka Lib Development)
@Lib_Development3h
Honestly this may be a situation where it's better to just not apply for federal funding and front the entire cost using state + local contributions
1
6
182
Lucas Pombo (aka Lib Development)
@Lib_Development3h
It seems that the MTA is going to try to speedrun the funding process for their proposed 125th street subway; very exciting
The MTA is proposing a new 125 Street Subway, which would extend west from the future 125 St/Lexington Av Q station. The project would connect existing subway lines—including the Second Avenue Subway—and bus routes along the corridor. Learn more about this project at a public scoping meeting; we're hosting two virtual sessions on October 22, and one in-person session on October 27. Register for a session and get all the details: mta.info/project/125-street-…
4
40
1,215
Lucas Pombo (aka Lib Development)
@Lib_Development3h
The headline of Tesla's release today is that they're probably about as safe as Waymo.
Lucas Pombo (aka Lib Development)
@Lib_Development3h
Replying to @Lib_Development
To close this off, here's the same data using the 4 Waymo categories, compared to Waymo and humans:
2
4
412
Lucas Pombo (aka Lib Development)
@Lib_Development3h
To close this off, here's the same data using the 4 Waymo categories, compared to Waymo and humans:
1
500
Lucas Pombo (aka Lib Development)
@Lib_Development3h
Assuming similar performance to Waymo, though, you'd expect it to still be zero. At this point, Robotaxi has not driven far enough to know the at-fault crash rate. But then again, that itself is enough to know it's clearly good enough.
1
103
Lucas Pombo (aka Lib Development)
@Lib_Development3h
If we use Waymo's definitions of any-injury-crashes, Tesla is probably at two over ~3 million miles, which is almost exactly the same rate as Waymo. In both incidents, Tesla was clearly not at fault.
1
1
100
Lucas Pombo (aka Lib Development)
@Lib_Development3h
The report says they went to the hospital "for an unknown reason", and there would be no reason to make this reason known to Tesla. But... 4 car accident, someone goes to the hospital, not an injury? That's, uh, surprising to say the least.
1
1
105
Lucas Pombo (aka Lib Development)
@Lib_Development3h
In the second crash, the description says "unknown" but this probably is because information didn't make it back to Tesla. The description is that the robotaxi was stationary when hit by two other vehicles in a collision of at least 4 cars. And someone went to the hospital.
1
1
111
Lucas Pombo (aka Lib Development)
@Lib_Development3h
Waymo: Any SGO reported crash with the field “Highest Injury Severity Alleged” is “Minor”, “Moderate”, or “Serious”, or “Fatality”). “Unknown” reported severity where the SGO narrative mentions injuries of unknown severity are also included. waymo.com/safety/impact/#met…
1
2
106
Lucas Pombo (aka Lib Development)
@Lib_Development3h
lmfao. I kind of can't help but laugh at this one. It's a reportable incident, and it caused an injury, but it isn't a crash. Under Waymo definitions (see below) it would count, but I kind of forgive Tesla for not counting it.
1
3
155
Lucas Pombo (aka Lib Development)
@Lib_Development3h
The first injury is described as follows: "Summary: The ADS was proceeding straight through a work zone on a street and drove over a pothole at approximately 29MPH. The ADS had two riders present in the vehicle. One customer alleged they sought medical care."
1
4
164
Lucas Pombo (aka Lib Development)
@Lib_Development3h
Oh, very clever. Tesla is using a really strange definition of "injured"; in practice, Tesla's SGO data lists two events with injuries (thread)
Lucas Pombo (aka Lib Development)
@Lib_Development4h
Tesla now has a robotaxi safety page to match Waymo: tesla.com/robotaxi/safety Of course, no Robotaxi has been in a serious crash yet, so it makes for an excellent looking dashboard. But Tesla has driven just over 1% of Waymo's 271 million driverless miles.
2
12
2,019
Lucas Pombo (aka Lib Development)
@Lib_Development4h
Replying to @santiago__lisa
AV operations are by-right in enough states that this will probably be irrelevant for enough time that the stats will be much clearer by the time they're in hostile jurisdictions
2
24