Austrian roads have a pretty simple numbering scheme. County roads aren't numbered at all IIRC, Federal Roads (roads connecting larger towns) have B numbers (for Bundesstrasze, meaning they are competence of the government, not the county) like B1 (from Vienna to Salzburg) or B221. Then we got the "Schnellstraszen", something between Federal roads and Expressways, having an S number and a speed limit of 120 km/h as opposed to 100 on anything below. They can look like full expressways with blue signs and everything, but sometimes also like simple small roads, only with blue signs and overtaking prohibited (double white line between the directions). Then we got expressways, 130 km/h speed limit and A number (Autobahn), like A1 (West expressway, Vienna to Salzburg) or A2 (South expressway, to Styria, Carynthia and eventually the Italian border).
