What must you check when transporting bicycles on a rear-mounted support system?

Your answer included all the necessary checks for transporting bicycles on a rear-mounted support system, which aligns with safety regulations under German traffic law.

1. Checking whether the system is adequate for the vehicle according to the manufacturer's instructions ensures that the equipment is compatible and safe for use. Using non-compatible equipment can lead to accidents or severe damage.

2. Ensuring that the system and bicycles are securely fixed prevents them from coming loose during transit, which is critical for both your safety and the safety of other road users.

3. Checking that lighting equipment or the number plate are not covered is essential as it ensures that your vehicle remains visible and identifiable while on the road. Obstructed lights or number plates can lead to traffic violations and make it difficult for other drivers to see you.

All these checks are vital for adhering to safety regulations and minimizing risks when transporting bicycles.