Stopped to get gas at the station. There were two mountain bikes parked by the door. A minute later, not two, but three people emerge--two riders, with one carrying a toddler in a back carrier.
I'm not sure about the safety of riding around on the roads with a youngster on your back. But they did have a helmet on the tot. So I guess if the kid fell out the right way and landed on its head, at least that much would be protected.