I wasn't ever a big fan of going riding alone. Not only for the breakdown/injury risk, but also because it wasn't as fun. 2 years ago I went up to meet some friends at the Big Horns in Wyoming for a day ride (sled not bike). I went up the Lovell side and they were coming up from the Sheridan side. The plan was I would ride down the trail (unplowed, groomed highway) and meet them at Bear Lodge. Took off and got 1/3 the way there and it was snowing and blowing up toward the pass to the point I couldn't see to continue. Turned around, went back to the truck, called and left a message on their phone that I wasn't going to make it. I rode around close to the lot for a little while and then decided to load up and be on my way.
Right as I was about to load up they showed up there on their sleds. They never got the message and came looking for me. The weather had cleared up top they said and they never had a problem coming over. So we went back out and rode in sunshine all day. Ended up back at Bear lodge at the end of the day, had a burger with them, and then headed back on my own. The trail back was about 20 miles straight down the groomed highway. About as safe as it gets.
Just as I got going I could see a front rolling in again so I picked up the pace to try and beat it. Got about 1/3 the way and blew the belt from the sustained higher speed running down the trail. Made a record setting belt swap and was on my way again: no spare belt and low on fuel. At the 1/2 way point on top the pass the weather hit. No snow thankfully, but what I got was almost worse: thick, freezing fog. I could see ahead for about the first mile and then as I progressed I could see as far as my ski tips and that was it. If there were trees on either side of the trail and I couldn't see them, but worse I knew I was going through the section that was wide open meadows on each side of the road. I had enough fuel in my tank to either get to my truck in the parking lot ahead, or get off my sled, turn it around in it's own track by hand, and head back. If I went back I was going to have to spend the night there and bum some oil to pre-mix in my sled to get back the next day. So I gambled and kept going. My one saving grace was the groomer had gone out and back just ahead of me setting out and the edge of the groomer had a plate sticking down that made a thin, deep groove in the snow for me to center up on and keep going with no other tracks on the trail to mess it up. So I locked on that and maintained a 10-15mph pace and was able to make it just after dark. The entire front of me and my sled had about 1/2" of frost built up on us by that time and I had 1" of fuel left in the bottom of my clear tank that I could see. I didn't see anything but white and fog for about 8 miles of that last 10.
After going through that, now I would have turned around and stayed the night in the hotel on the other side. I had a Spot locator with me, but in those conditions it wouldn't have been safe for anyone to come out and get me that night if something happened. I had a spare base layer top in my pack, but after a day of riding I was a little wet head-to-toe under my gear from perspiration. I had some food and water, first aid kit, emergency blanket, means to start a fire, and a good solid trail to walk on, but without being able to see in the location I was in, I would have had to dig in next to my sled and start burning parts of it for warmth.
After riding in the mountains for 20 years, that one experience fixed me from ever wanting to go it alone. I'll stay home and find something better to do.