The intersection problem for 2-(v,5,1)(v,5,1) directed block designs

The intersection problem for a pair of 2-(v,3,1)(v,3,1) directed designs and 2-(v,4,1)(v,4,1) directed designs is solved by Fu in 1983 and by Mahmoodian and Soltankhah in 1996, respectively. In this paper we determine the intersection problem for 2-(v,5,1)(v,5,1) directed designs.