Oh boy that story brings back memories of the two times I was barely moving and became a victim of Loose gravel. I was on my Honda 550-4 back in the latter 1970's. When you are turning and that front tire looses resistance with the pavement when you are moving...LOOK OUT!
No injury or damage, but mercy sakes that cement is hard!
So yes I have been down twice, and those experiences have never dimmed from my memory!