  The 3-arc graph of a digraph $D$ is defined to have vertices the arcs of $D$
such that two arcs $uv, xy$ are adjacent if and only if $uv$ and $xy$ are
distinct arcs of $D$ with $v\ne x$, $y\ne u$ and $u,x$ adjacent.
  We prove that Hadwiger's conjecture holds for 3-arc graphs.
