If I’m on an airplane or a bus or whatever, I’m not likely to be walking briskly.
Ever run to catch a train? Ever have to run from a train on platform 8, go down the stairs, sprint 50 yards, then climb the stairs to platform 2, then march eight pullman cars back to the one with your reserved seat - all while lugging a 50-lb suitcase and a 2-y-o child?
Regards,