The cab company I use has a touchscreen and POS for use by passengers, as is customary. Cab drivers often try to reach around back and manipulate the POS for m

The cab company I use has a touchscreen and POS for use by passengers, as is customary. Cab drivers often try to reach around back and manipulate the POS for me, which I detest. They are not supposed to be touching that, especially when I am deciding their tip for them. Anyway, the touchscreen, upon flag drop, immediately invites you to tap it thrice if you are vision-impaired, to activate an accessible voice interface. I did this once, and it apparently disabled the POS and we could't figure out how to pay my fare. Never again!