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[Polident]

tbh I never used or noticed them in airports. I’ve seen The Terminal and they’re a plot point there (Hollywood propaganda??) but the first time used them was at a supermarket in Yokohama last just year.

Also, don’t know how carts that activate a brake work with no identifiable electronics. Once I was parked towards back of the lot and it switched off a few feet from the car. I picked it up and carried it back. That doesn’t do anything to condition the civility of returning carts. More anti theft.