In which instances do you have to approach a pedestrian crossing with particular care?

Your selected combination is correct because all three points address important situations that require extra caution when approaching a pedestrian crossing, as stipulated by the German traffic regulations.

1. If pedestrians want to cross the road – drivers must always yield to pedestrians at crossings.
2. If the view of the pedestrian crossing is restricted – limited visibility can prevent drivers from seeing pedestrians, necessitating additional caution.
3. If another vehicle is already waiting at the pedestrian crossing – this indicates that pedestrians may be about to cross, and drivers should prepare to stop.

Recognizing all these scenarios helps ensure the safety of both pedestrians and drivers, thus promoting a safer traffic environment. Failing to acknowledge any of these situations could lead to dangerous accidents.