> suburban streets That, I imagine, is a fairly key difference. A child cycling suburban streets isn't likely to be building up any significant speed (due to l

> suburban streets That, I imagine, is a fairly key difference. A child cycling suburban streets isn't likely to be building up any significant speed (due to lack of training, intersections, not being in a rush, surrounding traffic being slow etc.), whereas an adult commuting likely will. Having seen the aftermath of a ~40MPH collision (car turned into the path of the bike, car was written off due to the extent of the damage), I'd be extremely reluctant to commute at speed on mixed-use roads.