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A [link url=http://ieeexplore.ieee.org/document/7936474/ target=_blank] new nano-carbon sensor [/link] of [link url=https://www.duke.edu/ target=_blank] Duke University [/link] measures the tread depth of tires accurate to the millimeter. The sensor, produced using 3D printing technology, is attached to the inside of the tire. The university team is currently working on the exact determination of tire pressure and brake pad inspection. Now the sensor only has to be able to directly communicate with the car.