So, in Schmidberger v Austria the Court of Justice held that Austria did not infringe article 34 by failing to ban a protest that blocked heavy traffic passing over the A13, Brenner Autobahn, en route to Italy.
In Schmidberger v Austria, the Court of Justice came to the conclusion that Austria didn't infringe upon article 34 by failing to ban a what?
a protest that blocked heavy traffic