If you travel through Austria without having a valid vignette, you might run the risk of getting fined. Such a fine has to be paid within a limited number of days. Unpaid fines can induce further penalties variating between €300 and €3000 and the vehicle might even be confiscated in order to force you to pay the fine (and additional penalty).   By means of camera assistance, the local Austrian authorities are able to keep track of drivers and check whether a valid vignette has been purchased.