What is the legal obligation of other motorists under § 26a StVO when an Austrian school bus stops with its yellow school warning sign and hazard warning lights activated?

1. Motorists may overtake the school bus at the standard open road speed limit (100 km/h)
2. Motorists traveling in the same direction must not pass the school bus while it is boarding or alighting children, and oncoming traffic on undivided roads must pass only with extreme caution at walking pace
3. All oncoming traffic must come to a complete standstill for at least 10 minutes
4. Motorists are required to sound their horns continuously while passing