Yesterday toward the end of day I headed out for a short bike ride and "constitutional" walk at a park and took a tumble on to the road because the driveway abutting it had a piece of debris on it that I hit. I'm riding a standard 1980s 12 speed Centurion 68cm bike. I held on to the bike as I took the fall, bruising my left outer lower hand and my right arm below elbow which was worse, several inches of a bruised scrape. I was wearing a short sleeve shirt. Definitely painful and jarring and unexpected. I'd normally expect the bike wheel to ride over small impediments. I'm posting this partly as a query on how to avoid falls in the future as well as to help others avoid them. I'll post pictures when I get a chance. The front bike tire will need to be trued, I'm hoping it was not permanently damaged.