Bud of mine did that in his driveway. He lives in a rural area, the bike pinned his ankle against a railroad timber and he could not get up.
Told me he laid there for 15 mins yelling for help, a neighbor lady finally heard him and came to his aid.

It's not speeding till you get pulled over.
https://www.youtube.com/watch?v=Bqa1s4jhkQ8