A free-flow toll road operator in Melbourne did something similar for the licence plate verification operators - they only hired deaf people, and their bosses l

A free-flow toll road operator in Melbourne did something similar for the licence plate verification operators - they only hired deaf people, and their bosses learnt to sign. The system automatically identifies the licence plate for tag-less vehicles using digital photography and OCR, but they are supposed to be verified, so the operators flip through the images quickly and look for mismatches.