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French Highway Limited to 90 Km/h Due to a "Magnetic Field" : We Explain Why

According to this sign, the A43 motorway, which runs along the valley of Arc (Savoie), crosses a magnetic field so powerful that it is necessary to slow down when you approach it. But this one has nothing supernatural. It owes its presence to the proximity of a century-old factory, which has played an important role in the history of the French industry. If you visited Savoie this summer, you may have gone along Saint-Jean-de-Maurienne via the A…
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According to this sign, the A43 motorway, which runs along the valley of Arc (Savoie), crosses a magnetic field so powerful that it is necessary to slow down when you approach it. But this one has nothing supernatural. It owes its presence to the proximity of a century-old factory, which has played an important role in the history of the French industry. If you visited Savoie this summer, you may have gone along Saint-Jean-de-Maurienne via the A…

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Révolution Energétique broke the news in on Thursday, August 21, 2025.
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