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At first, I take place and think with the stroller will slide at random when the bus is driving or braking of imagination. I associate it with the shopping cart can't brake immediately will run into some object or hit someone's foot also because of sliding.
So, I design an install can be accept placement on the wheel, it take advantage of the echo-location in bats, and can detect the wheel's distance from something it will be impacted, also the brake device will be started, allowing user to change cart’s direction or move backward until safety distance, in order to avoid hitting someone’s foot or some stuff.