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Posted by sodality2 12/10/2025

Show HN: Automated license plate reader coverage in the USA(alpranalysis.com)
Built this over the last few days, based on a Rust codebase that parses the latest ALPR reports from OpenStreetMaps, calculates navigation statistics from every tagged residential building to nearby amenities, and tests each route for intersection with those ALPR cameras (Flock being the most widespread).

These have gotten more controversial in recent months, due to their indiscriminate large scale data collection, with 404 Media publishing many original pieces (https://www.404media.co/tag/flock/) about their adoption and (ab)use across the country. I wanted to use open source datasets to track the rapid expansion, especially per-county, as this data can be crucial for 'deflock' movements to petition counties and city governments to ban and remove them.

In some counties, the tracking becomes so widespread that most people can't go anywhere without being photographed. This includes possibly sensitive areas, like places of worship and medical facilities.

The argument for their legality rests upon the notion that these cameras are equivalent to 'mere observation', but the enormous scope and data sharing agreements in place to share and access millions of records without warrants blurs the lines of the fourth amendment.

239 points | 146 commentspage 2
genewitch 12/11/2025|
How come any area that has enough homes in the data set and ALPR have Veterinarians as the most surveilled, then Hospitals, then Libraries, usually over everything else, including food and church?

The strange implication is that they're watching the vet office traffic to find people who are getting treated by vets instead of doctors?

also my parish reports 0.0% across the board, and all the parishes near me. you have to get on the coast to get above 25%.

sodality2 12/11/2025||
Vets/hospitals are far less common (and the former probably suffers from less tags as hospitals are more important) so the distance one must travel increases, so higher likelihood of crossing one. Especially compared to how common everything else is.

If you check deflock.me, would you say that 0.0% aligns with what you expect?

genewitch 12/11/2025||
i suppose that makes sense.

There's 6 cameras in the metro area per deflock.me, 3 at each Lowe's, and that's it. It's very easy to not get in range of those, at least on "my side" of the metro. How do we know that is all the ALPR in an area? Or rather, what's the confidence? I'd assume Home Depot would also have them, for example.

note: maybe i need to restart firefox, but deflock.me is the slowest "map" based site i've seen since keyhole in the late 90s

sodality2 12/11/2025|||
The best thing you can do is keep an eye out and tag them manually. The second best is a FOIA to your county government - there's some good examples on deflock.me and templates on muckrack. But private ones are not going to be FOIA-able.

The quality of ALPR tagging does probably lag behind true counts - for example, Williamsburg, VA has 28 tagged on OSM, but 32 are listed in the transparency log (https://transparency.flocksafety.com/williamsburg-va-pd). Unfortunately not much can be done except spotting them out and about (or wardriving with a BLE beacon scanner: https://www.ryanohoro.com/post/spotting-flock-safety-s-falco...)

rootusrootus 12/11/2025|||
The ones nearest me are at Home Depot, FWIW.
renewiltord 12/11/2025||
Perhaps there's some large chain of vets run by a PE firm where the PE firm did a blanket deal.
genewitch 12/11/2025||
I didn't mean to allude to this, but i heard that a lot of vet clinics are being bought by PE firms. The same way that a certain internet company is buying all the legal offices (and web medicine sites)
tamimio 12/11/2025||
What about Ring cams? Is there a deRing site? Also, the flock cams are beyond ALPR, I saw a video before about some investigation and one of the things was how flock was used to recognize a car without a plate. Flock is an automated car recognition system, the plate is just part of it. Makes me wonder if having extremely unique or “cloaking” car design will fool it.
duskdozer 12/11/2025|
I swear it's about 75% of houses I come across that have ring (or similar) cameras
DeathArrow 12/11/2025||
So you have a set of positions for some services (coffee shops, groceries), a set of positions for cameras and a set of positions for homes.

But how you model people actually driving each day and their paths? Because the accuracy of your conclusions seems to heavily depend on the accuracy of modelling.

sodality2 12/11/2025|
I don't model daily paths as in 'coffee before work, then groceries on the way home'; I do straight shots from residences to each of these amenities. I don't know of a better way to do it than this; any more complicated model that tries to model 'daily routines' risks losing simplicity, as well as straying too far from actual driving behavior, and my main goal is extremely simple statistics.
DivingForGold 12/10/2025||
https://archive.ph/et1uD
renewiltord 12/11/2025||
When it's against the law to not be on an ALPR camera, only outlaws won't be on ALPR cameras! Well, in SF, this is generally true because there is no enforcement of a missing license plate.
aunty_helen 12/10/2025||
Number plates are just one of the privacy tracking technologies. Any modern connected car infotainment system will report and have that data sold or anything that has Bluetooth can be tracked.
1970-01-01 12/10/2025||
Bluetooth? You're overthinking this. We've been mandated to carry 4-5 transmitters per vehicle broadcasting their UIDs at 315 MHz since the mid 2000s:

https://en.wikipedia.org/wiki/Direct_TPMS

EvanAnderson 12/10/2025||
I have an SDR in a facility that is a public parking lot. It picks up TMPS incidentally and I'm definitely able to track individual vehicles.
snarf21 12/10/2025|||
Including the camera and microphone in our pocket that pings every cell tower every time we move.
sodality2 12/10/2025||
At least as per Carpenter v. United States, that data requires a warrant, not just any cop/LEO in the country typing in a license plate with reasoning as 'investigation'. That's a much better standard.
exhilaration 12/10/2025|||
Recent car tracking discussion here https://news.ycombinator.com/item?id=46097624
sodality2 12/10/2025||
To an extent this data is within our reach to stop (buy old car, unplug cellular modules, etc). With ALPRs the only option is moving.
flyinghamster 12/11/2025||
Data accuracy can be a problem. It lists 115 counties for Illinois, which is news to me since Illinois has 102 counties.

For example, Kenosha County is in Wisconsin, not Illinois.

xnx 12/10/2025||
I'm surprised an app like Citizen hasn't tried to match Flock with a dashcam that automatically shares recordings.
reallyaaryan 12/11/2025|
Can you think of any use cases apart from government surveillance?
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