  We study a robust model of self-propelled rods interacting via volume
exclusion and show that its collective dynamics encompasses both that of the
corresponding Vicsek-style model (where local alignment is the sole
interaction), and motility-induced phase separation (which occurs when
repulsion is dominant). These results unify these heretofore largely
disconnected bodies of knowledge on dry active matter and clarify the nature of
the various phases involved.
