How do locks on the wheels of shopping carts work?

At first, I was surprised to see the sign that said the shopping carts would lock if anyone tried to take it out of the boundary line. And I was curious to see if they really would. They did and I was shocked! read more

The put it in the cart and pretend to walk around and get some bananas and head out the door. As they are pushing the cart, the wheels locks and they aren’t able to get what they need without lifting the already heavy cart with all of their stuff and it’s just a mess. read more

An electronic system works by locking one of the wheels, usually one on the front, when the cart is rolled out of a designated area. Each shopping cart is fitted with an electronic locking wheel, or ‘boot’. A transmitter with a thin wire is placed around the perimeter of the parking lot. The boot locks when the cart leaves the designated area. read more