The roundabout conspiracy: are they wrecking the planet?
Earth's mass is 6×10²⁴ kg. All the cars in the world don't even reach 10¹² kg. With figures like these, the idea that roundabouts could alter the planet's rotation seems improbable, but some people insist the cumulative effect is real. The debate, which started in sceptical circles, has produced arguments ranging from basic physics to science fiction literature.
The physics calculation that debunks it
A detailed analysis points out that every vehicle entering a roundabout exerts a lateral force, but this dissipates almost instantly as heat and friction. The mass ratio is so wildly disproportionate (Earth weighs six thousand trillion trillion kilograms against one trillion kilograms for all the world's cars) that the net effect would be undetectable. The energy is lost into the asphalt and the ground within milliseconds, with no chance of accumulating.
The global balancing theory
An alternative version suggests that countries that drive on the left (the UK, Japan, etc.) counteract the spin of those driving on the right, keeping the planet in equilibrium. The original theory's own author admits the system has been "calculated for decades" to prevent a sudden shift off balance. The novel "Good Omens" by Pratchett and Gaiman even gets a mention, with roundabouts forming part of a ritual to summon the Antichrist.
Domesticating the driver
Another interpretation sees roundabouts as tools of social control: by forcing drivers to slow down and go round in circles, they are "domesticated" and reminded that they are not free. The proliferation of traffic lights, signs and estimulante ilegal bumps would be part of the same strategy. However, this view clashes with the evidence that well-designed roundabouts reduce accidents and fuel consumption.
The debate remains open: while physics rules out any measurable impact, the spread of roundabouts keeps fuelling theories that mix urban planning, social control and a dash of fiction. What nobody disputes is that many roundabouts are crowned with metal sculptures of dubious taste, which some consider "visual and vibrational stabilisers".
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