License Plate Recognition (LPR) in Parking

License plate recognition (LPR), also called automatic license plate recognition (ALPR), uses cameras and software to capture an image of a vehicle and read its license plate automatically.

How LPR turns a plate image into an action: the backbone of ticketless parking, and the data trail at the center of the ALPR privacy questions in Bartholomew v. Parking Concepts.

In parking, LPR has become a core technology. It identifies monthly and permit parkers without cards, matches entries to exits for ticketless and gateless parking, connects reservations and validations to a plate, and supports enforcement on the street and in lots. Modern systems also capture plate state and vehicle details to improve match rates.

Uses in parking

Access control. Gates open for known plates. See PARCS.
Ticketless payment. The plate is the ticket; drivers pay by plate at a pay station or app.
Enforcement. Mobile cameras check paid status and time limits on the curb.
Data. Occupancy, duration and repeat-visit patterns.

Accuracy and privacy

Read rates depend on camera placement, lighting, plate condition and speed; plan for manual review of misreads.
Plate data is personal information in many jurisdictions. Some states, including California, regulate how ALPR data is used, shared and retained, and require published usage and privacy policies.
Set retention limits, restrict access and do not share data beyond what the parking operation needs.

The Parkonomics view

LPR turns the license plate into the parking credential. That is a big operational gain and a real privacy responsibility. Write the data policy before the cameras go up.