What is licence plate recognition (LPR)?

Licence Plate Recognition is often referred to as electronic chalking.

Traditionally, parking officers patrol car parking on foot and "chalk" tyres or manually inspect pay and display tickets.

LPR uses photo recognition to do this by recording and cross-referencing licence plate numbers.

This is done using an LPR camera, mounted on a Council patrol car, that is connected to an on-board computer.

In practice:

  1. Parking officers drive along a street or area and record licence plates using in-car Licence Plate Recognition.
  2. Officers complete a second "pass" along the street or area at the end of the regulated parking limit. In a 2P area this is every 2 hours; in a loading zone every 20 or 30 mins, and so on. 
  3. At the end of the section, LPR cross-references photos taken in both passes to determine if a vehicle has overstayed in the parking bay.
  4. Parking officers stop the vehicle, print out any parking infringements and place a ticket on the offending vehicle's windscreen if a valid permit is not displayed.
  5. It no offence has been committed, all photos and data related to the vehicles are permanently deleted from the system.
Last updated: 07 October 2015