When driving a vehicle in a tunnel and the vehicle breaks down and in consequence of which the vehicle cannot move:
Neither the driver nor the passengers shall smoke or manipulate an open flame. If a separate heating unit is used for heating the broken-down vehicle, it must be switched off in the tunnel
Neither the driver nor the passengers shall smoke or manipulate an open flame. If a separate heating unit is used for heating the broken-down vehicle, it may be left on in the tunnel.
Neither the driver nor the passengers shall manipulate an open flame. Smoking is allowed only in places reserved for this purpose. If a separate heating unit is used for heating the broken-down vehicle, it may be left on in the tunnel.