Austrian Autobahn Vignette:
you do not need one when not using any Autobahn
if ordering an electronic one at ASFINAG.AT you have to order it some 2 weeks in advance
if you purchase one at the border or at any larger petrol station the Vignette is operational as soon as you stick it to your windscreen
Austria has some toll-streets where you have to pay extra - local toll stations accept € or Ccards