Bicycles and stop signs...

I watched two young girls ride their bicycles down Brookgreen today and race through the intersection with Edgewater without stopping.

What traffic rules apply to bicycles in that situation? This appears to be pretty clear that bicyclists most obey all traffic rules.

In any case, if I were the parent, I'd take away the bicycles until the girls really understood the importance of stopping where there is a stop sign.

A day later, I saw a couple of young kids on bicycles cross a street at a crosswalk --- but mounted on their bicycles and without stopping before crossing. Didn't there used to be rules that children should cross streets walking their bikes? Riding them without stopping strikes me as unacceptably dangerous.