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Sources

Where the facts come from

Every factual claim on this site links to its source. This is the full list.

How we checked

We only use expert sources: Encyclopaedia Britannica (its written articles, not its AI summaries or question boxes), the National Motor Museum, GOV.UK, the Royal Automobile Club, the British Motor Museum, the UK Motorway Archive and the Isle of Man TT Races. Each fact was written in our own words alongside its source. Our build script stores the source text and, for every fact, checks that the key words and figures really appear in it. 190 of 190 checks passed when this site was last built (3 Nov 2026). Where we couldn’t find one of those sources saying it, we left the claim out. Where two sources give different figures, we quote both: Britannica’s Bertha Benz article puts her drive at about 60 miles and its Karl Benz article at some 66 miles.

The charts and games

Our charts and Speed Through Time use only the figures in the sourced facts. Records given only as “over 200” or “over 400” mph are drawn at that figure and marked “over”. The quiz, sorting, timeline and pairs answers come from the pages below.

All sources (27)