How ALPR works
The core loop is the same regardless of vendor: capture → recognize → log → match. A camera reads a plate, software converts it to text, the system records plate + timestamp + location, and checks it against hotlists. See the full step-by-step for the most common brand: how Flock cameras work — and the industry-generic version: how does an ALPR work.
Who uses ALPR
| User | Typical use |
|---|---|
| Police departments | Stolen-vehicle alerts, investigations, AMBER alerts |
| Cities & counties | Traffic and public-safety monitoring |
| HOAs & gated communities | Vehicle entry logging |
| Private businesses | Parking enforcement, lot security |
The legal picture
There is no single national ALPR law. State rules govern how long plate data can be kept, who can access it, and whether commercial use is restricted. The patchwork is exactly why residents need state-specific answers — see ALPR laws by state and the data retention explainer.
Why it matters
A plate read with no match is still a record — and records can be shared, kept and queried long after the moment you drove past. The questions that matter aren't brand-specific: can police track my license plate, how long the data lives, and who can see it.