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In 2016 there were 324 billion miles travelled by car.
Worldwide there are around 1 billion cars.
If each of these has an average of 25,000 miles on the clock, then the total distance they have travelled is 25 trillion miles.
Which is around 4.3 light years.
Which is the distance from earth to Alpha Centuri, the nearest star system to the Sun.
Not really to do with this thread, but I thought it was an amazing thought you might be interested in.