Thanks! Gosh, I hadn't even thought of that. They are pretty well restrained w/ the silver bars (both on the sides and the rear), but I have seen setups without those bars where the kids just hang on to nylon straps or a handlebar/ring mounted behind the seat post. I'd be too nervous w/ the little one for that, but w/ the bars I feel totally safe, though I do have a helmet mirror so I can hop on the curb if someone is approaching too closely.

By the way, we did notice that the oldest had his helmet on backwards and readjusted it before we took off.