Why do the keypad buttons on drive-up automatic teller machines have Braille dots?
Braille dots on elevator buttons and on the keypads of walk-up automatic teller machines enable blind persons to participate more fully in the normal flow of daily activity. But even though blind people can do many remarkable things, they cannot drive automobiles on public roads. Why, then, do the manufacturers of automatic teller machines install Braille dots on the machines at drive-up locations?
The answer to this riddle is that once the keypad molds have been manufactured, the cost of producing buttons with Braille dots is no higher than the cost of producing smooth buttons. Making both would require separate sets of molds and two different types of inventory. If the patrons of drive-up machines found buttons with Braille dots harder to use, there might be a reason to incur these extra costs. But since the dots pose no difficulty for sighted users, the best and cheapest solution is to produce only keypads with dots.
See, all these seemingly ridiculous things almost always have some sort of logic behind them.
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