Under what circumstances may you cross a junction during a red light?

The combination you selected is correct because, according to German traffic laws, drivers may cross a junction during a red light under specific circumstances.

1. When an emergency vehicle with a blue light and siren approaches, you must yield to it. This may require crossing the intersection to provide space for it to pass safely.
2. If a police officer is present and directing traffic, their instructions take precedence over traffic signals. You should always follow their directions, even if it means crossing during a red light.

Understanding these exceptions is crucial because they prioritize public safety and the movement of emergency services over standard traffic rules. Always remain vigilant and responsive to emergency situations while driving.