Light doesn’t always travel at ‘the speed of light’ (299,792,458 metres per second). It only travels at that speed when travelling through a vacuum; when it passes through matter, it slows down. The slowest light has ever been recorded moving at is a 38mph, while passing through an ultracold gas of sodium atoms.
So if you have been down the M1 you van say you have travelled travled faster than light!
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