What must you be prepared for here?

This sign indicates the presence of a "Verkehrshelfer," which means a traffic assistant, often a school crossing guard.

According to German traffic rules, you must be prepared for two main things:

1. Traffic may have to stop unexpectedly because the traffic assistant is helping children cross the road safely. The flowing traffic could be interrupted.

2. Children are more likely to cross the road at this point, so you need to be especially vigilant and ready to stop.

The third option, that children will be playing on the road under supervision, is not correct here. The focus is on crossing safety rather than play.

Understanding this helps you approach the area cautiously and be ready to stop as directed by the traffic assistant.