To have the perfect line you have to notice the imperfect child! You know the one who talks in your line, can't keep their hands off others or drags their hand along the entire wall all the while weaving in and out of the traffic line they are suppose to be a part of. When there are difficulties with students complying with walking correctly in line find that one moment to notice when they are in compliance, acknowledge that behavior with a recognition badge.
Original Story: When the positive recognition badge lanyard was first being introduced I visited with the student. I found out what he/she loved and developed their badges based on what appealed to them. She was fascinated with bees and he liked the superheros. The teacher was the keeper of the icons and the student wore their lanyard with pride, even when their recognition badge lanyard had nothing to display. It took an entire week to fill up their badge, but that moment they were noticed and the icon was handed to them, so they could place it on their badge, they were drawn into the process. There will be at least one moment each day that they will be compliant, notice that moment. By noticing the small effort they make, you are clearly communicating that you were impressed.