Technocyclist
Motorized Bicycle Senior Technologist
I dunno if this qualifies for an motorized bicycle, but here is a link that shows how safe it can be and is highly dependent on the attitude of the rider, and how you ride your motorized bicycle. The article is for bicycles and not motorized bicycles, but it would be interesting to note that it's safer than staying in your living room as the statistics show... 
http://www.kenkifer.com/bikepages/health/risks.htm
always ride safe, but if you can't then at least try to heal fast painlessly...

http://www.kenkifer.com/bikepages/health/risks.htm
always ride safe, but if you can't then at least try to heal fast painlessly...