A colossal pedestrian bridge has opened in a European capital, marking a milestone in sustainable urban transport. The 1,200-metre (4,000ft) structure, believed to be the world's longest pedestrian bridge, connects the islands of Laajasalo and Korkeasaari near Helsinki, Finland. Notably, it is reserved exclusively for trams, pedestrians, and cyclists, with no cars allowed.
A Shift Towards Sustainable Living
Architect Tom Osborne of Knight Architects described the bridge as representing "a shift towards more sustainable ways of living." He explained that the €150 million (£126 million) Kruunuvuori Bridge is part of a larger £505 million project extending the tram network by about six miles from the city centre to Laajasalo, where a major housing development is underway.
The bridge's width varies from 49 to 62 feet, with a 65-foot maximum clearance. It takes an average person around 15 minutes to walk across. Osborne noted that the bridge is not only the longest and tallest in Finland but also a vital link for a new community, promoting sustainable growth.
Longevity and Design
The bridge is designed to last 200 years, far exceeding the typical 120-year lifespan for structures of this scale. "Taking a 200-year position on the returns of that investment – in both financial and climate terms – shows that big projects need to be paired with a long-term view," Osborne said.
Its tall central tower, a distinctive feature in Helsinki's low-lying landscape, was chosen to reduce clutter at deck level and avoid the expense of multiple smaller towers. The deep water on either side of the tower also made smaller spans more costly.
Adapting to Finnish Winters
The architects considered harsh Finnish winters in the design. The bridge's stay cables are designed to remain in constant slight motion in the wind, preventing ice buildup. A textured plastic coating on the cables causes ice to break into fine particles rather than forming icicles. A sophisticated wind warning system will display alerts on electronic signs at each end during strong gusts.
Osborne expressed hope that the bridge will inspire a new generation of structures built with sustainability in mind. "Over the next 200 years, I hope this diamond becomes not only a symbol of its place, but a symbol of a shift towards more sustainable ways of living," he concluded.
