I saw 15 feet on here somewhere, not sure where yall got that from but if you do a quick google search they are between almost 9 and 10 feet depending on the car, as far a remember they fit in the subway platform pretty flush, so lets say the gap is 9-11, which is still pretty decent size. I would say the hardest part of this would just be dodging the cops and concerned citizens and that insane run up.