Thousands of experiments have been undertaken to measure it ever more precisely, and no result has ever spotted a particle breaking the limit.
We filmed 15 vehicles including a bus, a post van and numerous cars which, according to a flashing speed warning sign, were breaking the limit.
Should it tell the police to issue a ticket if you are breaking the speed limit?
He is in the process of appealing after being found guilty of breaking the speed limit on Coniston.
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The latest figures suggest on average around 200 drivers were caught breaking the speed limit every day last month.
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It needs to make savings as early as next year if it is to carry out its promised tax cuts of euro3 billion without breaking the deficit limit decreed by the euro zone's stability and growth pact.
"There's something inherently wrong with setting up a race that you can only win by breaking the speed limit, " says Susan Kang, attorney for the Flint family, adding that even after Flint's death Strava users continued setting KOMs on that course, a feat that requires defying the posted speed limit amid often heavy automotive traffic.
Germany is also heading for a third successive year of breaking the euro's budget limit next year.
Instead, Whitehouse called for breaking off a provision that would limit ammunition magazines to 10 rounds, saying he believed it could win Senate approval as a separate measure.
While the Craig Agriculture Jobs bill purports to limit the reward it offers for breaking our immigration laws to those illegal aliens who can prove they worked for a few days in the agricultural sector, the reality is that it will have a vastly multiplied effect.
The BBC understands discussions are continuing in Whitehall about whether it is possible to limit pensioner benefits - such as the winter fuel allowance, bus pass and free TV licence - without breaking Prime Minister David Cameron's election promise that he would preserve them.
BBC: Welfare spending to be cut by ?4bn, says George Osborne
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