Not just in Scotland...I was in Ashford, Kent over xmas and we had a severe frost, the car was totally frosted up but outside ambient was 5 deg according to the car. No ice warning. Cleared the car, drove 300yrds and, on a bend in the shade of a block of flats, the car lost traction on black ice. Recovered well on the winter tyres, just a big 4 wheel slip and grip. Looked in my mirrors to see the Mondeo behind me slide right off and into a childrens play park!
Stopped and walked back, they were all OK and they had managed (by luck, not skill) to avoid anything large and metallic in the playpark. Their NS alloy was badly buckled/broken, but the car was driveable.
We forget up here in Bonnie Scotland that the overdosing of grit and salt on the roads has its benefits too.
Of course, being the South, 45mins later it was 7-8 deg and all the ice was gone.