  Here we study a driven lattice gas model for microtubule depolymerizing
molecular motors, where traffic jams of motors induce stochastic switching
between microtubule growth and shrinkage. We term this phenomenon
\enquote{traffic dynamic instability} because it is reminiscent of microtubule
dynamic instability [T. Mitchison and M. Kirschner, Nature 312, 237 (1984)].
The intermittent dynamics of growth and shrinking emerges from the interplay
between the arrival of motors at the microtubule tip, motor induced
depolymerization, and motor detachment from the tip. The switching dynamics
correlates with low and high motor density on the lattice. This leads to an
effectively bistable particle density in the system. A refined domain wall
theory predicts this transient appearance of different phases in the system.
The theoretical results are supported by stochastic simulations.
