It has been a long time since I wanted to write a piece about the mythical borne d’angle of Michelin. You can still find them here and there along French roads. At first, I thought it was a simple painted concrete structure. The signs actually look like tiles from inside a car. Upon closer investigation, it appears that Michelin used an ingenious technique. In section: two layers of enamel on lava rock, 15 mm thick and mounted on reinforced concrete. And the organization around it was evenly amazing. The production of this road signage by Michelin ran from 1908 to 1971.
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