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Light travels at c in a vacuum. No mass can be accelerated to the speed of light. There are theoretical particles (tachyons) that travel faster than light, but their existence has not been demonstrated.

c = exactly 299,792,458 metres per second (1,079,252,849 km/h).

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It is 268mph or 431kph by the Bugatti Veyron SuperSport.

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6y ago
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10y ago

432.7 km/h is the reported fastest speed on a public highway.

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Q: What is the fastest speed ever recorded on a public highway?
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