ANPR Parking Fine Errors: When Cameras Get It Wrong

ANPR Parking Fine Errors: Challenging Camera Evidence

Automatic Number Plate Recognition (ANPR) cameras are used extensively by private parking operators to monitor vehicle entry and exit times. While the technology is generally reliable, it is far from perfect. ANPR errors are one of the most common grounds for successful parking appeals.

How ANPR Parking Works

ANPR cameras photograph your vehicle's number plate as it enters and leaves a car park. The system:

1. Reads the registration number from the image using optical character recognition (OCR)
2. Records the timestamp of entry and exit
3. Calculates the duration of stay
4. Compares the stay against the permitted terms (e.g., 2-hour maximum)
5. If the stay exceeds the terms, a parking charge is generated
6. The operator obtains keeper data from the DVLA and sends a charge notice

Common ANPR Errors

Misread number plates: OCR software can confuse similar characters. Common misreads include:

• 0 (zero) read as O or D
• 1 (one) read as I, L, or T
• 8 read as B
• 5 read as S
• Partial plates captured (e.g., only front or rear)

Incorrect timestamps: Camera clocks can drift if not regularly calibrated. Even a few minutes of error can mean the difference between a legitimate stay and an apparent overstay.

Double capture: A single entry or exit may be captured twice if the vehicle pauses near the camera (e.g., waiting for a barrier to open). This can create ghost records or incorrect stay calculations.

Capturing passing vehicles: Cameras positioned near road entrances may capture vehicles passing on the adjacent road rather than entering the car park. These vehicles never actually parked.

Missing entry or exit image: If one camera fails to capture the plate (due to angle, dirt, speed, or lighting), the system may pair an entry with a different exit, or calculate from midnight.

Clone plates: In rare cases, your registration may match a cloned vehicle. If the vehicle in the ANPR images is clearly not yours, this is a strong defence.

How to Challenge ANPR Evidence

1. Request the ANPR images

You have the right to request the ANPR entry and exit photographs. Under GDPR/Data Protection Act 2018, you can make a Subject Access Request (SAR) to the operator for all personal data they hold, including ANPR images. The operator must respond within 30 days.

Check the images for:

• Is the number plate correctly read?
• Is the vehicle in the image actually yours?
• Are the timestamps plausible?
• Are both entry and exit images present?

2. Provide counter-evidence

If you believe the ANPR times are wrong, provide:

• Receipts from shops or restaurants showing when you were there
• Fuel receipts with timestamps
• Dashcam footage
• Parking app payment records
• Bank card transaction timestamps
• Witness statements

3. Challenge the system reliability

Ask the operator:

• When were the cameras last calibrated?
• What is the system's accuracy rate?
• Are there any known issues with the cameras at this site?
• How is the system maintained?

The Legal Standard for ANPR Evidence

Private parking operators must prove their claim on the "balance of probabilities" (more likely than not). ANPR evidence alone may not meet this standard if:

• The images are unclear or do not show your vehicle
• There is no corroborating evidence
• You provide counter-evidence showing different times
• The system has known reliability issues

At POPLA and IAS, adjudicators have repeatedly held that unclear ANPR images are insufficient to prove a contravention.

ANPR and Data Protection

ANPR systems process personal data (your vehicle registration number and images of your vehicle). Operators must comply with data protection law:

• They must have a lawful basis for processing your data
• They must display signs informing you that ANPR is in use
• They must respond to Subject Access Requests within 30 days
• They must not retain data longer than necessary
• If they are not complying with data protection law, this can support your appeal and may be grounds for a complaint to the Information Commissioner's Office (ICO)