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by andygates 2935 days ago
UK carts commonly have a wheel lock that engages when the cart rolls out of bounds. That stops the casual seepage of hardware. Won't work for scooters, alas.

Some also have small cash deposit (routinely spoofed with a similar-size token, but that doesn't matter, the tokens cost about the same as the coin). Maybe adding one of these and a reward prompt ("Did you park nice? Well done!")?