Sächsilüüte, "The six o'clock ringing of the bells") is a traditional spring holiday in the Swiss city of Zürich celebrated in its current form, usually on the 3rd Monday of April - Burning of the Böög. See ALT text.

It's sort of endearing, this parade of Zürich police men and women, don't you think? It's a different picture of the police than we normally see. ~
They probably are on their way to the police men's. Or maybe a Bierstube for a cold pint.