If a blind person needs money and the bank is closed, the only way they can get it is through an ATM. So a few options are:
ATMs use standard number pads and buttons, it's cheaper to just use the same ones for all machines instead of special non-brail just for the drive up.
Or
If there are not other ATMs around and a blind person must go to the bank, their friend (or somebody) could drive them over to the ATM and that way they are still secure without giving out their pin number.
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