Just months before millions of its internal documents were stolen and dumped on the internet, the Tennessee-based surveillance company Perceptics was preparing to pitch New York’s transit authority on how it could help enforce impending “congestion pricing” rules, according to leaked documents reviewed by The Intercept. The pitch, as outlined in the files, went well beyond mere toll enforcement and into profiling New Yorkers’ travel patterns and companions, creating what experts describe as major privacy risks.

Congestion pricing, on the face of it, doesn’t seem like it would present a privacy risk — it’s a traffic policy, after all, not some new NYPD initiative. The plan is to essentially tax the cars that clog Manhattan’s streets and route the proceeds to public transportation, providing both a deterrent against and palliative for traffic. There won’t be any congestion pricing toll booths: The fee will be assessed automatically and electronically, potentially by photographing the license plates of passing cars and sending the plate owner a bill in the mail. This requires cameras running around the clock, dutifully recording every car that comes and goes. And this, Perceptics claims, is where the company truly shines.

According to an internal presentation released by the Perceptics hacker and reviewed by The Intercept, the company pitched New York’s Metropolitan Transportation Authority, or MTA, in February of this year on how Perceptics’ car-scanning camera arrays, already deployed and honed in areas like the Mexican border and an assortment of U.S. military installations, could help the MTA track down drivers. It’s unknown how the plan was received by the MTA, which administers public transit, bridges, and tolls for New York City and some of its surrounding suburbs, but leaked Perceptics emails show that the company shipped camera hardware to the MTA’s Bridges and Tunnels division for a live demonstration.

Perceptics did not respond to a request for comment. An MTA spokesperson told The Intercept that “all details are still to be determined” regarding congestion pricing enforcement.

The presentation document, titled “Smart Imaging Solutions for New York City Congestion Pricing,” makes clear that Perceptics wants to “produce vehicle-specific profiles” using cameras and “unique machine learning algorithms,” allowing the city to immediately recognize and build travel histories of every car in the congestion zone. Law enforcement and surveillance experts said the system described goes far beyond what would ever be necessary to mail scofflaws traffic tickets. Instead, it is an entirely new sort of surveillance apparatus that tracks deeply personal information like “customer travel patterns and travel consistency,” the number of passengers in the car, or “likely trip purpose,” and associates this information with a unique fingerprint of every vehicle that passes by Perceptics’ cameras.

Allie Bohm, a policy counsel with the New York Civil Liberties Union, described the Perceptics plan as an “incredibly privacy-invasive proposal” that “raises all sorts of associational and First Amendment concerns.” Bohm expressed particular alarm about the possibility of a congestion pricing enforcement system eventually feeding data into the NYPD’s existing surveillance regime. “The NYPD has fancied itself an intelligence agency for a very long time,” said Bohm. “These are folks who are pioneering some really, at best, questionable, and, at worst, alarming programs of surveillance and of drawing conclusions from innocuous behavior.”

The MTA will not deploy congestion pricing before 2021 and has yet to select a tolling vendor. But whether Perceptics wins a contract or not, its idea to bring to the heart of Manhattan military-grade surveillance technology — already provided to Saudi Special Forces and the Jordanian army, according to a Perceptics document — is an example of how something as innocuous-sounding as congestion pricing can turn into a surveillance sprawl.