  We consider random walks in Dirichlet environment (RWDE) on $\Z ^d$, for $ d
\geq 3 $, in the sub-ballistic case. We associate to any parameter $ (\alpha_1,
..., \alpha_{2d}) $ of the Dirichlet law a time-change to accelerate the walk.
We prove that the continuous-time accelerated walk has an absolutely continuous
invariant probability measure for the environment viewed from the particle.
This allows to characterize directional transience for the initial RWDE. It
solves as a corollary the problem of Kalikow's 0-1 law in the Dirichlet case in
any dimension. Furthermore, we find the polynomial order of the magnitude of
the original walk's displacement.
