I don't know... my reservations about child trailers in NYC has little to do with safety. I mean...NYC drivers are aggressive and rude but they aren't murderous for the most part. Or even unskilled. I've heard this argument before and it really makes no sense when you think about it. Isn't your safety at least as important as your child's? If cycling in traffic is too dangerous for a child, then it's also too dangerous for the parents. So (IMO) the safety issue is moot. Being down near ground level with buses, trucks, SUV's and other large bulky vehicles at close quarters in a two track trailer? I just don't think it would be pleasant. Up a little higher on a bike child seat or, if they are old enough, on a kid back or longbike kid pad, I think would be an improvement. I would of course stay off the big arterial roads and probably avoid peak traffic times as well when riding with children.