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Ring I (pronounced "ring one", , ) is the busiest of all highways in Finland, carrying up to 113,000 vehicles per day. It is the innermost of the three beltways in the Greater Helsinki region, numbered as regional route 101 and runs from the eastern-most part of Espoomarker to Itäkeskusmarker in eastern Helsinkimarker. The total length is , of which are in Helsinki. It is primarily intended for local traffic—before the large road numbering change in the 1990s and the reconstruction of Ring III, Ring I was also designated as a bypass for avoiding Helsinki centre.

Ring I has at least two lanes per direction for its entire length but a speed limit that never exceeds owing to heavy traffic. With the introduction of new grade-separated interchanges, provisions have been made to increase the speed limits to 70–80 km/h . Eventually, all of the junctions on Ring I will be upgraded to grade-separated interchanges. However, the road was not originally constructed as a motorway, which limits its capacity. .

, a major modernisation project on the road is under way at Leppävaaramarker, Espoomarker, where the road is being diverted into a tunnel. The aim is to ease the flow of traffic in what was previously the worst traffic bottleneck in the Greater Helsinki area.


Image:Keha1pukinmaenasema.jpg|Ring I in the evening. Photo taken near Pukinmäki, in the northernmost tip of the road.Image:Keha I accident in Pakila.jpg|Rush hour comes early, as an accident forces westbound traffic to two lanes. Photo taken from a bridge in Pakila.Image:Lassila KehaI+TietoEnator1m.jpg|TietoEnator buildings line Ring I in Pohjois-Haaga, Helsinki.

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