Just in case we become delusional and think that Cat 4 or any other races are safer than Cat 5...think again. Here is a photo sequence near the finish of a race this weekend - pretty sobering. The fence on the right side is barbed wire. I did a time trial race that day. BTW, the Cat 5 field also had a crash at the finish line! Bad day for the 4s and 5s.
There may be a lesson...big field plus narrow road may = problems at the finish.