Police say visibility may have been a factor in a fatal pedestrian accident on Farrington Highway last night.  A 59-year-old man was struck while crossing the highway at about 9 p.m. near Aliinui Drive in Ko Olina.  The man was with a co-worker, who was not hit. They were on their way to the Aulani Resort.  The 24-year-old woman driving the vehicle that struck the man was not injured.