Happened to me as well a few months ago. Clear night, no fog, was driving with 40 km/h on a 60 km/h road, with one lane per direction and no possibility of overtaking. Got stopped by the police car behind me to be asked... "
Warum fahren Sie so langsam?"
No papers checked, just got off with a recommendation to drive next time with "
genug Geschwindigkeit." Although I was aware of the
StVG Ar. 26, I never thought this was a thing in CH.