Conservative councillor Margaret Lyon, who represents the area, said repairs were essential because the road forms the start of a route around the scenic Great Orme headland.

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The road immediately behind this end of the complex forms the unmarked border between Monaco and France.

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Its six villages are cut off from the rest of the country, except for a single mountain road that runs through a broad belt of virgin forest that forms part of the Swiss National Park.

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Black ice is a glaze that forms on roads and pathways that is actually transparent, allowing the black road beneath to be seen through it.

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