Quoth wolfie
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If someone decides to take a cart outside of the premises, the cart would have pass over a sort of electromagnetic "mat" that would activate the clamp and thus lock the wheel. Therefore there is no risk for, say, wheelchairs or strollers to get locked up.
But of course, some of the clamps would now and then be defect and activate within the premises. I've tried that now and then, but it wasn't worse than I'd just drag the cart to the Customer Service Desk (luckily I haven't tried that with a fully loaded cart... yet) and ask them to release my deposit coin so I could go over and fetch another cart.
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