  We study travelling wave solutions of a 1D continuum model for collective
cell migration in which cells are characterised by position and polarity. Four
different types of travelling wave solutions are identified which represent
polarisation and depolarisation waves resulting from either colliding or
departing cell sheets as observed in model wound experiments. We study the
linear stability of the travelling wave solutions numerically and using
spectral theory. This involves the computation of the Evans function most of
which we are able to carry out explicitly, with one final step left to
numerical simulation.
