The Barcelona City Council commissioned the firm to improve the pedestrian experience through better lighting and air quality. First, a layer of photocatalytic concrete will replace the existing surface. This self-cleaning material neutralizes air pollutants by absorbing nitrogen oxides and converting them into harmless substances, and can also be applied to white or gray cement.
All pollution removed will be simply washed away by the rain, guaranteeing a self-sustaining method that is environmentally non-invasive. This same technology will be modeled in the Italian pavilion at the upcoming Milan Expo 2015.
Reminiscent of the glowing roads currently being trialled in the Netherlands, the bridge will harness glow-in-the-dark phosphorescence using photoluminescent glow stones to provide ambient light. Non-toxic and non-radioactive, the stones absorb solar energy during the day, which they slowly metabolize by night.
BCQ will also mount photovoltaic solar panels to power low-energy LED lighting fixtures. Meanwhile, the area will be vegetated by green walls and pergolas covered in climbing plants. “It enables better interaction between pedestrians and vehicles, provides the space with vegetated arcades and changes the image of the bridge to distinguish it as one of the gates of Barcelona,” the architects said.
As the gateway linking traffic from the north to the Catalonian capital, and spanning the Avinguda Meridiana, a major avenue, the dual carriageway will become a hoped-for meeting point between the two Trinitat neighborhoods.