I had to drive from Canmore to Prince George years ago when I had the Civic. It was April or May, and a nice drive up the Icefields Parkway, so I really wanted to be on my summer tires. The forecast called for isolated flurries in the morning, then clearing, so figured I’d chance it on the summers.
I got to the top of Bow Summit when I hit the snow. Freshly fallen on the bare highway, and temps right around freezing. Had to slow down to 20 km/h, but the car just followed the crown of the road and slid down to the right. Thought for sure I’d slide into the ditch, but once the tires got onto the shoulder, there was enough of the winter sand left to provide some grip and stop the slide.
So I drove at 15 km/h with two wheels on the shoulder for a good 15 minutes until the snow finally cleared. It was clear sailing after that, and I was able to properly enjoy the rest of the drive. Still, it was a dumb decision not to just put the winters back on for that drive. Thankfully it was early morning and I was the only one (dumb enough to be) on the highway. It could have been ugly in traffic.