As the self-proclaimed "gateway to Eastern Europe" Vienna has a pretty good set of motorway connections to get people into and past the city.
And there are no real bugbears for those foreigners with a car in Austria at it is much the same as other Western European countries.
Drivers' license, Green Card and a reflective vest in the car are obligatory (those still with the old-style UK license may have fun watching traffic police trying to decipher them even though they are still valid).
In Austria, motorway use requires a "vignette" - a toll sticker which can be attached to certain points on the inside of the windscreen. There are also variable speed limits on some parts of the motorways which react to traffic density and environmental conditions. And upper motorway speed limits (daytime 130km/h) drop on certain motorways when driving later at night.
Finally note that from November to mid-April winter tires (or snow chains on at least two tires) are obligatory.
The motorway system converges onto a ring road (the "Gürtel" or "belt") with traffic from the west coming on the A1 Westautobahn ("west motorway"), from the south on the A2 Südautobahn ("south motorway"), from the east and the airport on the A4 Ostautobahn ("east motorway") and from the north on the A22 Donauüferautobahn ("Danube bank motorway").
Vienna does have a number of Park + Ride locations on the outskirts of the city mainly in connection with U-Bahn stations. More information is available on the useful map published by the relevant section of the Chamber of Commerce: www.parkandride.at
Almost all of the inner city street parking is short-term parking (with meter). Those wanting longer term parking spots should choose a hotel or apartment with parking facilities or one of the overnight garages near the centre.
The central bus station in Vienna is located at Wien Mitte (also a busy U-Bahn and S-Bahn stop). Buses run from here to Eastern Austria and to some international locations. Buses from Vienna airport arrive either at the Westbahnhof railway station, the Meidling railway station (the replacement for the closed Südbahnhof), at the Donauzentrum near the Kagran underground station on the U1 line, or the central Morzinplatz on the Daube Canal.
Vienna is an important transport hub for central and eastern Europe and has a good choice of ways of getting to the city and of moving around once you are there.