A New Era for Helsinki Cyclists and Pedestrians: Introducing the Mariantunneli

The City of Helsinki is moving forward with the development of the Mariantunneli tunnel, a 200-meter infrastructure project aimed at enhancing connectivity and safety for cyclists and pedestrians. This tunnel, which will pass under Mechelininkatu, forms a key link between Helsinki’s Baana cycling network and the planned Länsibaana extension to Espoo, offering a dedicated route for sustainable transportation.

Designed to streamline east-west bicycle and pedestrian traffic, the Mariantunneli tunnel will help users avoid crossing the busy Mechelininkatu, where about 36,000 vehicles pass on a typical autumn weekday. This critical addition to Helsinki’s cycling infrastructure will not only reduce congestion but also improve safety by allowing commuters a seamless path across a major intersection. Additionally, the tunnel’s design considers emergency access, with provisions for ambulances to use the route when necessary.

The Mariantunneli is thoughtfully designed with features to enhance user experience and security. It will include advanced lighting systems, featuring both ceiling and booster lights, as well as color-changing wall lights that can adapt to different seasons or events. Such design elements aim to make the tunnel inviting and safe for all users, particularly during darker winter months. Moreover, to accommodate the changing urban landscape, the project includes a dedicated bicycle street on Lapinlahdentie, where vehicle speeds will be adjusted to match those of cyclists, further prioritizing pedestrian and cyclist safety.

Estimated to cost around €19 million, the Mariantunneli tunnel is part of Helsinki's 10-year capital investment program. Public consultation on the project is open until November 25, 2024, with political decision-making scheduled for January 2025. Once approved, this tunnel will contribute significantly to Helsinki’s sustainable urban development goals by promoting eco-friendly transit options and reducing the reliance on cars in congested areas.

This forward-thinking infrastructure project is an example of Helsinki's commitment to fostering a more connected, pedestrian- and cyclist-friendly city.