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Let's break it down...
The distance, between the traffic light and the cab driver, should be approximately 10 meters.
The time light needs to reach the cab driver's eyes is:
D ÷ c = 10 ÷ 299,792,458 = 0.0000000333... seconds = 0.0000333... milliseconds
The distance between the cab's horn and your ears, should be approximately 5 meters.
The time needed for the cab's honk sound, to reach our ears is:
D ÷ u = 5 ÷ 295 = 0.0169491525 seconds = 16.9491525 milliseconds
If the cab driver had a reaction time of zero, it would still take 16 milliseconds for us, to hear their honk.
The conclusion is that cab drivers have a negative reaction time, so that they can honk before the light turns green, breaking causality.