Correct, Dez. LRP set up a car with sensors on the wheels and suspension to detect wheel slip and adjust the throttle accordingly. Ralf Helbing (GM) went one further and used a helicopter gyro to receive signals selecting side slip to automatically counter-steer a skid.
I think it was at a Euros that this key was detected. It was decided to ban it. The wheel sensors were easy to detect, but the gyro wasn't until someone pointed out that if you picked the car up from the grid and waggled it from side to side, the wheels would steer! Imagine the sight of scrutineers standing on the start line picking up cars and waving them in the air!!
Yes, a speedo could detect sudden acceleration that characterises wheelspin, but as stated above, that might mean the car has simply hopped over a bump (either on tarmac or off road) and then throttle back when the fast way is to keep the throttle pinned. That's not proper traction control, it's just detecting sudden acceleration of the motor.
There's nothing you can do to detect its presence, but it will sell because people think it is faster when it probably isn't.
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