Electronic enforcement of Zona Azul — Brazil's paid rotational street parking — works by reading the plate of a parked car, checking in seconds whether that plate has a valid activation, and recording digital evidence when it does not. Instead of the old paper ticket book filled in by hand, the process today is an automatic chain: image capture, plate reading, a query to the activation database and, only then, the possible recording of an irregularity.
From reading the plate to checking the activation
It all starts with capturing the plate. This can happen via a tablet/electronic ticket book operated by an officer on foot, or via a vehicle equipped with OCR cameras (optical character recognition) driving the streets. The software identifies the plate's characters and queries the central system: does that vehicle have an active session within its time limit? If so, nothing happens — the car is compliant. If not, the system flags the situation for the next step.
What the system records as evidence
When there is no activation, enforcement does not "fine on the spot" blindly. It assembles a set of evidence: a photo of the vehicle, the plate read, the exact date and time (timestamp) and the location. This package forms the chain of evidence that gives legal certainty to the process and lets the driver contest based on objective data. The Aretron AI supports image analysis to reduce misreads, and the Provloc certified geolocation ties the record to the exact point on the street.
Why being read is not the same as being fined
An important detail: a vehicle being photographed and having its plate read does not mean an immediate fine. In most cities, the sequence respects grace periods and, where it exists, the Post-Use Fee (TPU) — an administrative charge that acts as a second chance to regularize before any traffic infraction.
| Stage | What happens |
|---|---|
| 1. Capture | Camera/tablet photographs the vehicle and the plate |
| 2. Reading (OCR) | The software converts the image into plate characters |
| 3. Query | The system checks for a valid, in-time activation |
| 4. Decision | Compliant: closed. Irregular: evidence recorded |
| 5. Regularization | Where there is a TPU, a window opens before the fine |
When it actually becomes a fine
If the irregularity persists — TPU unpaid, or a city without a TPU, or time exceeded without regularizing — the case may fall under Art. 181, XVII of the CTB: a serious infraction, a fine of R$ 195.23, 5 license points and removal of the vehicle. This amount is federal and does not change from city to city; what varies locally is the fee, the hours and whether or not a TPU exists.
In the municipalities served by Areatec, plate reading and activation checks are integrated into the Digipare app, used by drivers to activate their paid session. Areatec operates the largest OCR fleet in the world for this type of enforcement.