Yet Another Door Distribution Again. This is an pair of automatic entry doors to the terminal at Dulles airport outside of Washington, DC. Although the doors open automatically as you approach, passengers pushing luggage carts ahead of them hit the bottom edge of the doors when they open too slowly. This leaves a distinctive wear pattern on each door. Most carts hit the same spot, some cause wear a little higher, some cause wear a little lower. This could be from different cart heights or different loads on the carts or from the slight dents in the door from the repeated bumpings, causing the carts to hit more off the center target. A bell-shaped frequency distribution is left behind. Most wear in the center less towards the extremes.
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