we have one for DD - it lives in the car for when we go to markets and things where she wants to be walking with us, but we may have hands full of shopping etc so just don't have hte same reflexes if she darts off. she's never done it while out an about, but she does do it at home sometimes, so the fear is there. the local farmers market is in island in the middle of a major road - awesome central place - but also surrounded by traffic, so a worry! we used it when we went on holidays - she asked for her puppy dog and then held our hands. i dunno, i think maybe she felt more secure too - so if she did stop to look, she could feel us just as much as we could feel her