Why are coaches only allowed one way Beauvoir to Noirmoutier on the Passage du Gois?

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I read on https://www.passagedugois.com/crbst_3.html (mirror):
Coaches [are only allowed] one-way Beauvoir to NOIRMOUTIER.
Why are coaches only allowed one way Beauvoir to Noirmoutier on the Passage du Gois?
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How long is Passage du Gois?
THE GOIS: AN UNFORGETTABLE CROSSING The Gois Passage is a 4.2 km long, sometimes flooded road connecting Noirmoutier Island to the continent.Where is the road in France that can only be used twice a day?
The Passage du Gois (French pronunciation: \u200b[pasa\u0292 dy \u0261wa]) or G\xf4a is a causeway between Beauvoir-sur-Mer and the island of Noirmoutier, in Vend\xe9e on the Atlantic coast of France. The causeway is 4.125 kilometres (2.6 mi) long and is flooded twice a day by the high tide. A road runs along the causeway.When was the Passage du Gois built?
In 1971, a bridge linking the island to the mainland was built as an alternative route to the island of Noirmoutier.Advocacy before International Courts and Tribunals - 14 June 2022
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