Helsinki–Turku motorway

Helsinki–Turku motorway. It is a vital 164-kilometer controlled-access highway in southern Finland, designated as part of European route E18 and national main road Valtatie 18. The motorway forms the primary road transport corridor between the capital region and the country's oldest city, traversing the provinces of Uusimaa and Finland Proper. Its construction, spanning several decades, significantly reduced travel times and bolstered economic integration within the Greater Helsinki area and the Southwest Finland region.

Route description

The route begins at its eastern terminus at the Ring I in the Munkkiniemi district of Helsinki. It proceeds westward through the city of Espoo, passing near the Tapiola district and the Nuuksio National Park. The motorway continues through the municipalities of Kirkkonummi and Vihti before reaching the city of Lohja, a major intermediate hub. The western section runs through the Salo region, historically significant for the Nokia Corporation, before culminating at its junction with the Ring Road on the eastern approach to Turku. The highway crosses several significant waterways, including the Espoonjoki and Siuntionjoki rivers, and provides a direct link to the Port of Turku, a major gateway to Sweden and the Baltic Sea.

History

Planning for a high-speed road link began in the post-war era, with the first segments opening to traffic in the 1960s under the administration of the Finnish National Road Administration. A major milestone was reached in 1996 with the completion of the Lohjanharju bypass, which alleviated congestion through the center of Lohja. The final section between Salo and Kuusjoki was upgraded to motorway standards and opened in 2009, marking the completion of a continuous motorway between the two metropolitan areas. This development was a key project for the Finnish Transport Infrastructure Agency and was partly financed through the European Union's Cohesion Fund.

Major interchanges

Key junctions along the route facilitate access to major population centers and regional roads. From east to west, these include the connection to Kehä II in Espoo, the interchange for Kirkkonummi and Suomenlinna ferry services, and the Lohja East and West interchanges serving Lohja and Nummi-Pusula. The Salo interchange provides a critical link to the Turku–Toijala railway line and the city center. Further west, the Kuusjoki and Paattinen interchanges distribute traffic towards Loimaa and Naantali, respectively, before the motorway terminates at the Ring Road interchange near the Turku Science Park.

Traffic and usage

As a cornerstone of Finland's national road network, it carries substantial daily traffic, with the busiest sections near Helsinki recording over 50,000 vehicles per day. The route is indispensable for freight transport, connecting the Port of Helsinki and Port of Turku, and is heavily used by logistics firms like Posti Group and DB Schenker. It also serves as the main road access to Turku Airport and supports commuter traffic for universities such as the University of Turku and Åbo Akademi University. Traffic volumes are monitored by the Finnish Transport and Communications Agency.

Future developments

Planned improvements focus on increasing capacity and safety. The most significant project is the planned extension of the Ring I in Helsinki, which will improve the motorway's integration with the capital's network. Studies are also underway for adding additional lanes between Espoo and Kirkkonummi to address congestion. Long-term strategies by the Finnish Transport Infrastructure Agency consider the motorway's role in the proposed Finland Tunnel project to Tallinn, which would further integrate it into the Trans-European Transport Network (TEN-T).

Category:Roads in Finland Category:Transport in Uusimaa Category:European route E18