Cycling through France last summer we passed several entire classes of 20-30 kids all on bikes led by a teacher front and back, off on one school outing or another.
It was a regular occurence there, we were very impresed with one pair of teachers turning up at the local municipal swimming pool with a class of 8 year olds just as the another pair of teacher were leaving with their class of 14 year olds. Every one on a bike