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.
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The ones that I have experience with have magnetic brakes, and all sidewalks have magnetic pads at all points that leave the supermarket’s property, and to prevent someone using the pavement to circumvent the magnetic pads, the pavement has cattle grids.
These brakes only work on the pads, and if one was to drag the cart over them, the wheels function normally afterwards.
As a taxi driver, I used to drag carts over the pads at the rear of one supermarket when picking up customers during this time of the year as it could take over 30 minutes to get out of the parking lot during ‘silly season’.
I did return the emptied cart to the correct side of the pad afterwards.
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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