How the FIA exposed all of F1’s cheaters️

At the 1999 European Grand Prix, it was revealed that many teams had been cheating by intercepting the start signals broadcasted by the FIA to begin the race. The race director uses a specific broadcast signal and starts a sequence of five red lights that last the same amount of time.
Many of the teams, unbeknown to the FIA, had discovered how to intercept this signal and devised a system based off it that would send an auditory warning to the drivers 100 milliseconds before the last red light goes out, giving them what looked like a perfect start. At the 1999 European Grand Prix, the directors exposed all of the teams using this system by keeping the radio signal the same, but delaying the lights from going green - this meant that all the teams using the cheating systems would jump the start, not knowing the timing of the lights would be different this time around.

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