Once…for about 6 hours.
I was told it hasn’t happened in about 3 years and it was rare for even that.
I was amazed at how organized they are with bad weather though, incase it happens. Sprayed all the roads down with anti-ice stuff, not sure what it is. Shut down some ramps, bridges that ice over quick. All the high-schools have an automated system that calls all the parents of the kids if school is cancelled.