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The change will be in effect from Monday evening on 12 March 2018. The detour is aligned next to the current route, and when the detour is in use, it is not possible to turn left from Ring I to Tapiolantie and Tekniikantie. The detour will be deployed in order to build a new road in the area. Traffic on Ring I will pass through an interconnector and a tunnel in the future.

Driving westbound to Otaniemi is possible through the traffic light intersection at Kalevalantie or by going round Karhusaarentie to Otaniemi. Driving eastbound to Tapiola is possible through the traffic light intersection at Kalevalantie or through the Tapiolantie intersection by Länsiväylä. The new detour is aligned with the current route, and will go past Gasum’s building and the partially closed Miestentie. The lanes on the left are narrower near the Gasum building on Ring I.

Turning left from Ring I to Tapiolantie (eastbound) and Tekniikantie (westbound) is not possible after the detour is in place. Turning right from Ring I to Tapiolantie and Tekniikantie is allowed for now. There are no changes to direction of travel straight onwards from Tapiolantie and Tekniikantie and nor in either direction on Ring I at this point. Driving across the ring road is slightly more complicated, however, and will require commuters to pay careful attention to the road.

Turning left in the area is not allowed for traffic safety reasons. It is not possible to turn left from Ring I even after the construction work is finished.