A motor vehicle with air brakes has not been used for several days. When may you set off at the earliest (vehicle fully loaded)?

In the context of vehicles with air brakes, it's crucial to ensure that all systems are functioning properly before setting off. The correct scenario requires a combination of conditions to be met for the vehicle to operate safely.

1. The signals for the pressure warning device must have stopped, indicating that the air pressure has reached a safe level. If you ignore this signal, you risk driving with insufficient brake pressure, which could lead to brake failure.

2. The spring-loaded brake should release automatically. This ensures that the brakes are disengaged and the vehicle can move. If the brakes do not release, the vehicle would remain immobilized, leading to potential damage to the brake system.

3. Having 3 bar reserve pressure ensures there is sufficient air pressure in the system to safely operate the brakes. This serves as a safety margin, providing an additional buffer against any potential air loss during operation.

All these points are interconnected in ensuring the vehicle is safe to drive. Following these regulations helps prevent accidents and ensures compliance with German traffic laws.