Motorists using the Harbour Bridge or tunnel are set to be stung with a new charge each time they don't hear that familiar beep from their e-tag.
From June 1 motorists will be charged an extra 55c “vehicle matching” fee on top of the regular toll when they cross the Harbour if they don't travel with a tag or it fails to register.
Previously a photograph was taken of the car's number plate and the toll was automatically added to the account linked to that car at no extra cost.
A Roads and Maritime Services spokeswoman said the new fee would cover the cost of matching up the driver's number plate with their tolling account.