If, while the vehicle is driving in a tunnel, a vehicle breakdown occurs for which the vehicle has become immobile:
Neither the driver nor the person being transported may smoke or handle open flames . The independent heating of a stationary vehicle must be switched off in the tunnel .
The driver of the vehicle does not mark the vehicle as an obstacle to road traffic .
The driver of the vehicle and the transported persons may remain in the vehicle if they immediately report the stopping of the vehicle to the police or to the person supervising the operation of the tunnel .