Norwegian County Road 405 (Fv405) is a Norwegian county road which runs between from the village of Engesland in Birkenes municipality in Agder county in the north to the junction with the Norwegian National Road 9 in the village of Mosby in Kristiansand municipality in the south.

The road is 54.56 kilometres (33.90 mi) long.

[1][2] Prior to a 2010 government reform, the road was classified as a Norwegian national road.

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