Like, how do they work? They’ve been around since nearly as long as cars have been around so it’s not some fancy modern engineering. How does it know what speed the cars going?
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There are several ways but the most basic is “look at the wheel axle rotation”. If you know the diameter of the wheels, and the wheels aren’t slipping, you can easily calculate the forward speed from the rotation speed. It’s a simple formula: for every wheel turn the car moves [circumference of a wheel] forward.
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