Bus lines operated by the railroads and post office connect all the towns and villages not served by train, using vehicles with snow chains when necessary in winter. Even so, some of the highest roads can become impassable for a few hours. And except in the most remote areas, buses are frequent enough that you can get around.
In Innsbruck the deluxe ski buses that depart from the Landestheater on Rennweg, across from the Hofburg, are the most convenient way to reach the six major ski areas outside the city. A Club Innsbruck pass (free from the tourist office or your hotel if you spend one night or more) gives you complimentary transportation to the ski areas. Many hotels even provide shuttle service to the ski bus stop.