A fire fighting apparatus for road and railway tunnels consisting of a remote controlled vehicle which is provided with a thermal water-cooled shield and is allowed to run along a monorail secured to the tunnel and acting also as water pipe to extinguish fire. The present invention provides such synchronization without resort to a network time standard. The access network determines whether sufficient resources are available to support the given multicast session. Ideally, the supply shaft andor collecting shaft isare constructed as a friction shaft, so that the transfer of the rotational movement of the friction shaft to the transfer film supply roll andor transfer film collecting roll is carried out via a frictional connection between shaft and roll, which can be overcome by tensile forces of the transfer film web. The invention also provides a corresponding method of flight control. The statistical coding module is operable to code each of the bit plane symbols bps i,bp as a function of one or more of the corresponding context values to produce a context-based encoded symbol stream.