What must you remember concerning the lighting equipment of your vehicle?

The selected combination of answers is correct because all three points are crucial for ensuring that your vehicle's lighting equipment is safe and compliant with German traffic laws.

1. Correct installation ensures that lights are positioned properly and function as intended, which is vital for visibility and signaling to other road users.

2. Cleanliness is important because dirt or obscured lights can significantly diminish their brightness and effectiveness, increasing the risk of accidents.

3. Being in operating condition is essential for all lights to function correctly when you need them, such as during nighttime driving or poor weather conditions.

Together, these factors contribute to road safety and compliance with regulations outlined in the StVZO (German Road Traffic Licensing Regulations). It is necessary to ensure that all conditions are met to operate a vehicle legally and safely on the road.