It was cold, middle of winter. My driveway is pretty long asphalt, on a pretty steep incline, and there isn't much speparating it from my neighbor's driveway. It had snowed the day before, and I shoveled my driveway. It was about 30 degrees when I left for work and the driveway was clear.
It was a beautiful day, warmed up to around 50 degrees!
It got chilly again at night. When I headed home it was about 30F again. When I arrived at home, I got about halfway up the driveway before my bike just stopped moving forward. I kept giving it gas, but it wasn't going anywhere. I came to a stop in the middle of the hill, holding the front brake. When I put my foot down, it slipped out from under me, but I managed not to drop the bike, and the front brake was holding.
I realized that during the day the snow on my neighbor's driveway had melted and the water ran down the hill onto my driveway. When it got cold again, all that water turned to ice, leaving a sheet of black ice covering my entire driveway!
I was stuck for about 5 minutes. Yes, FIVE LONG MINUTES, trying to figure out what to do. I tried spinning the rear tire to try to melt the ice underneath, but that small patch of asphalt wouldn't allow me to get up the hill. Then it would just freeze back over. I tried leaning the bike over onto the sidestand so I could get off, but any leaning immediately caused the front wheel to start sliding sideways. I could barely even put my feet down without sliding.
I couldn't let go of the bars to get my cell phone and call for help. I would have called and had someone put salt down.
Finally, I started realizing that I had to make some choices here. I could try rolling backwards back down the drive about 25 feet and hope that I didn't fall over before I hit the end. Seemed like I could easily break my neck doing that. I could try to slide the bike sideways and point the nose forward, then try to roll down with out falling over and breaking my neck. Also quite risky. Then I finally realized that I had better minimize the damage to my body. I decided to just let the bike fall over as gently as possible, but roll myself out of the way so I wouldn't get hurt too much.
So sure enough, I rolled off the bike onto the ice and tried to keep it from crashing down onto the drive as softly as possible, then I had to let it slide down to the street, about 25 feet. Due to the ice, I guess, there really wasn't any damage! I managed to escape uninjured as well.
From that point on, I am much more conscious of the temperature and the possibility of frozen patches when I ride in the cold.