Image may be NSFW.
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The soon to open Evergreen kosher supermarket in Lakewood (perhaps as early as Tuesday of this week) will have smart Shopping carts that lock if taken out of the parking lot area. There are electronic wheel locking systems that make it possible. Its not purely mechanical. Either one or two wheels of the cart are called SmartWheels and have electronic locks embedded in them. Also a cable goes below the yellow boundary line which serves as an antenna to send out the signals. When the wheels reach the proximity of the yellow line (cable), the electronic lock in the smart wheel receives the signal and activates, thus stopping the cart.
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