Of course, driver’s license requirements are already a plot point, since my protagonist is from Manhattan, and New York City is one of the few places where a 16-year-old might not yet know how to drive, and would have minimal experience, regardless. Not because of mass transit, but because the driving age is 18 there.
Meanwhile, another research question. For those of you who have had broken arms or legs, especially in your teens: just how much did it hurt? And just how capable were you of focusing on other things while it was hurting, before some form of painkillers arrived? That is, just how consuming, or not, was the degree of pain? (Thanks!)