Of course another issue would relate to childrens' bikes. Put little Jimmy on a bike with training wheels only to find he strayed off your driveway and onto a public area and there's a cop wanting to fine you for letting him ride without a license? No thanks. What happens when Jimmy can balance without the training wheels and rides to school? Does he need a permit? If so the cost-effective method of letting kids ride to school just got expensive.

If little Jimmy doesn't need a license to ride to school, at what point does he need a license? When he's 15? 18? 21? How long before cops end up either diverted to challenging kids who are 17 but look 18 why they don't have a license, or ignoring the rule altogether? Will we demand that children carry identification documents so they can cycle to school?