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Ring III
Kehä III (''"ring three"'', ''National road 50''; or ; (スウェーデン語:Ring III) or ) is an important highway in Southern Finland. It is the outermost of the three beltways in the Helsinki region, and the first one to be built. It lies across the four Finnish municipalities of Kirkkonummi, Espoo, Vantaa and Helsinki. Shaped like an arch, the road is long, of which only a very small fraction passes within the borders of Helsinki itself.
==Overview==
Work on Kehä III started in 1962, on the base of an existing road. The construction was finished in 1972, initially with only one lane per direction. Most of the Ring has since been expanded to at least two lanes per direction, although the westernmost end is still one-lane per direction in places.
The most recent construction work has been extensive renovation on its busiest stretch in Vantaa, where several interchanges have been built or improved, and lanes added. Industrial development along the road has introduced higher volumes of heavy traffic.
The European route E18 is routed through Kehä III, bypassing central Helsinki.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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