There are stores like Target, Marshall’s, among others that have a yellow line marking the perimeter where the shopping car can move freely, but once you pass that yellow line the shopping car breaks and don’t move.
In: Technology
The ones I’ve seen have a spring loaded sheath that springs out over a wheel when a magnetic catch is released. Fairly simple mechanism, and it needs a special tool to reset it once a trolley has been taken past the barrier.
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