Eastlink is a 39km toll road operated by ConnectEast, that runs through the eastern and south-eastern suburbs of Melbourne, Australia.
It was constructed in 2008 and observes more of a million vehicle passages per day, making it one of the busiest tollway operations in the country. The original tolling system at the time relied on a high on-board units, also known as tags, to be operational to determine the identity of the vehicle for charging purposes, as well as an Optical Character Reading (OCR) engine that would determine the license plate number (LPN) for those transactions corresponding to vehicles without a tag. This resulted in a large number of images that needed to be manually reviewed and validated by operators.