I can remember doing it in the late 70s, as did quite a lot of my classmates. Pretty much every kid with the full complement of arms and legs rode bikes back then anyway, so we tended to look on it as a good excuse to ride our bikes at school. It was done in the playground, but still drummed some road sense into you all the same. In the scheme of things the cost was peanuts in relation to the benefit. No hi-vis and helmet nonsense back then either, just a trouser clip if you wore longs so you didn't get dirty chain oil on your leg and a bollocking from your mum.