I know that signs for bathrooms, exits, elevators, etc., have the braille under the regular writing, but how does a blind person find the braille in the first place?! Especially when they don't have someone with them. Then you wouldn't need the braille anyways, just ask the person what it says. That always confused me.
They're always in the same place, either on the door or right next to the door at shoulder-height. Blind people learn to sweep the door and the wall with their hand to find the sign and then the braille on the sign.