I saw a man riding a bike very quickly down a crowded city sidewalk with a baby in a Bjorn! The baby did have a helmet on, but he did not. He could only steer the bike with one hand, since you have to lean over to grip the handlebars, his other hand was supporting the baby. How dangerous! Think of all the things that could happen. It wasn't even a street I'd feel completely comfortable riding a bike on by myself just for the traffic.
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