Around here most of the bike trail riders, young and old, don't stop where the trail crosses a road, even though there is a stop sign on the trail for the riders. When the traffic "thins out" they simply ride across the road and wave at oncoming cars assuming they will stop because "cyclists have the right of way". When I see people doing this I point to the stop sign and tell them the sign is for cyclists. They just smile and go on their way. I haven't seen anyone get hit — yet — but I've seen a lot of close calls and a few unhappy motorists.