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 .
Neither the driver nor the person being transported may smoke or handle open flames . The independent heating of a stationary vehicle may remain switched on in the tunnel .
The driver and the transported person must not handle open flames, they can only smoke in places designated for this purpose. . Independent heating of a stationary vehicle can remain switched on in the tunnel .