What is the minimum distance a vehicle must leave clear in front of traffic lights if the traffic lights would be concealed by the vehicle?

You answered correctly. According to German traffic regulations, if your vehicle would block the view of traffic lights for other road users, you must leave at least 10 meters of space in front of the lights. This ensures that everyone can clearly see and follow the signals, which is important for safety and smooth traffic flow. Always remember to stop far enough back so that the lights are visible to others behind you, especially when driving larger vehicles.