What Is ANPR and How Does It Work?
By the DC Fire & Security engineering team — installing and maintaining fire and security systems since 2010. Updated June 2026.
Quick answer
ANPR (Automatic Number Plate Recognition) is camera technology that reads vehicle number plates automatically, converting each plate into searchable text with a timestamp and image. Businesses use it to open barriers for authorised vehicles, log every vehicle entering a site, manage parking, and provide evidence — modern dedicated ANPR cameras read plates reliably at up to 95%+ accuracy, day and night.
How does an ANPR camera read a plate?
A dedicated ANPR camera combines a sensor optimised for fast shutter speeds with infrared illumination tuned to the retroreflective surface of UK plates. The camera isolates the plate in the image, runs optical character recognition on it, and outputs the registration as text with a confidence score, timestamp and overview image. Good installations control angle, height and lane width — plate reading is geometry as much as software, which is why a general CCTV camera 'with ANPR mode' disappoints at site entrances.
What do businesses use ANPR for?
- Automatic barrier and gate entry for staff and authorised vehicles — no fobs to lose
- A timestamped log of every vehicle entering and leaving a site or yard
- Blacklist alerts: known problem vehicles trigger a notification the moment they arrive
- Parking management and visitor tracking on commercial premises
- Evidence: matching a vehicle to a time and gate after theft, fly-tipping or damage
What are the rules on ANPR and data protection?
Plate data is personal data, so business ANPR falls under UK GDPR: you need a lawful basis and documented purpose, signage telling drivers ANPR is in use, a justified retention period, and security around the data. For a typical site-access system this is straightforward to satisfy — we supply the signage and configure retention as part of installation. What you must not do is repurpose access-control plate logs for anything you haven't told people about.
Frequently Asked Questions
How accurate is ANPR?
Can ANPR work at night?
How much does an ANPR system cost?
Can my existing CCTV do ANPR?
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