Sometimes it's those unexpected hazards which catch you by surprise.
@flowerbug , I had a near miss on the way to the Michigan seed swap. Because the weather had been warm enough to melt any snow on the road, we decided to drive the northern route, through the U.P. & into lower Michigan. The weather was unseasonably warm, it was a beautiful drive, and there was no snow or ice in sight for the entire drive. But somewhere in the U.P. there was a hill, and the road turned on the backside. Invisible
until you came over the hill was a river of snow melt, covering about 50-75' of the road - on the downhill curve!

I reacted quickly, but still hydroplaned a little, until we coasted onto dry road. We were fortunate that I was not driving any faster, and that no one was in the oncoming lane when we hydroplaned. There really should have been signage warning motorists of that hazard, I hope no one had an accident there.