Under Austrian road traffic law (StVO § 46 Abs. 6), how is the emergency corridor (Rettungsgasse) formed on motorways and expressways in congestion, and which emergency numbers apply in Austria?

1. As soon as traffic stagnates, vehicles in the far-left lane move as far left as possible; all vehicles in other lanes move as far right as possible (forming a clear corridor between the left and adjacent lane); Austrian emergency numbers: Fire 122, Police 133, Ambulance 144, Euro-Emergency 112
2. Vehicles stop wherever they are and wait for police instructions; emergency number is 911 only
3. Vehicles in all lanes move to the left lane to leave the hard shoulder clear
4. The emergency corridor is formed only after an emergency vehicle is seen in the rearview mirror