Molecular motors do not work in isolation {\it in-vivo}. We highlight some of
the coordinations, cooperations and competitions that determine the collective
properties of molecular motors in eukaryotic cells. In the context of
traffic-like movement of motors on a track, we emphasize the importance of
single-motor bio-chemical cycle and enzymatic activity on their collective
spatio-temporal organisation. Our modelling strategy is based on a synthesis-
the same model describes the single-motor mechano-chemistry at sufficiently low
densities whereas at higher densities it accounts for the collective flow
properties and the density profiles of the motors. We consider two specific
examples, namely, traffic of single-headed kinesin motors KIF1A on a
microtubule track and ribosome traffic on a messenger RNA track.Comment: 9 pages including LATEX text and 9 EPS figure
