I personally think its a very good and reasonable question. Maybe there was a bear or moose on the trail or shady person and he wanted to walk where he felt he may be safer. He could have been walking on the side of the road and stumbled to the side of the traffic or trying to cross.  It just does not make sense that an intelligent young man would just walk on the highway. Yes I do believe there is more to this and hopefully APD will find out who killed this young man and his family have some sort of closure.