For what should your prepare yourself in this situation?

In this scenario, as you approach a stopped public bus in an urban area, you must be especially cautious for two reasons. First, when the bus starts moving, it may swing out into your lane. Buses often need extra space to re-enter traffic, so you should be prepared to slow down or stop if the bus pulls out. Second, it is very common for people—especially children or elderly—who have just exited the bus to cross the street behind it. They may not be visible to you until they step out from behind the bus, so you must reduce your speed and be ready to stop. Both of these risks are well-known in German traffic rules and highlight why you selected the correct answers. You do not have to prepare for the quad moving, since the main dangers here are from the bus and pedestrians. Always approach stopped buses carefully in city traffic.