This paper is devoted to Wiener index of directed graphs, more precisely grids. The grid Gm, n the Cartesian product Pm□Pn paths on m and vertices, in a particular case when = 2, it called ladder graph Ln. Kraner Šumenjak et al. 2021 proved that maximum digraph, which obtained by orienting edges Ln, all layers isomorphic one factor are same way except (corresponding an endvertex other factor) p...