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Some 80% of Costa Rica's exports and imports, and a chunk of Nicaragua's, pass along a single-carriageway road and a modest wharf at the run-down Caribbean port of limon.

哥斯达黎加80%的进出口和尼加拉瓜的大部分进出口，都依赖于一条单行道和利蒙省一个破败的加勒比港口的小码头。

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Officials said it also caused congestion, as other tall vehicles backed up the single carriageway road.

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English Heritage, which objected to the choice of route, said the single carriageway road would damage the city's 900-year-old cathedral.

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The Attleborough bypass is one of the few stretches of single carriageway, and travellers cannot overtake slow-moving tractors and lorries.

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