TDU course & a very dodgy bit of road

Training for the TDU challenge tour a week before the Norwood to Goolwa ride with a small group I came to grief in a pretty nasty fashion. After completing the Fox Creek climb we descended down into Woodside. I was second in a line of six riders with a regular riding comrade in the front , as we hit the bridge over the Onkaparinga River he almost came off but was fortunate enough to see a large ridge in the road between the bridge structure and the bitumen , was able to lift his front wheel enough to avoid losing it altogether but still got the wobbles.I was approx. 25 metres behind and wasn't so lucky and he looked around to see me going over the handle bars and smash head first into the road. My riding mates were then confronted with me lying unconscious and bleeding badly from a series of head wounds.An ambulance was called and I was taken to the RAH casualty where I spent the rest of the day.