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One common feature of a vehicle, an ant and a kinesin motor is that they allconvert chemical energy, derived from fuel or food, into mechanical energyrequired for their forward movement; such objects have been modelled in recentyears as {\it self-driven} ``particles''. Cytoskeletal filaments, e.g.,microtubules, form a ``rail'' network for intra-cellular transport of vesicularcargo by molecular motors like, for example, kinesins. Similarly, ants movealong trails while vehicles move along lanes. Therefore, the traffic ofvehicles and organisms as well as that of molecular motors can be modelled assystems of interacting self-driven particles; these are of current interest innon-equilibrium statistical mechanics. In this paper we point out the commonfeatures of these model systems and emphasize the crucial differences in theirphysical properties.Comment: 7 pages, 11 embedded EPS figures, REVTE

Traffic Flow of Interacting Self-Driven Particles: Rails and Trails, Vehicles and Vesicles