The city of Zürich is characterized by two main geographical borders: the Limmat and the Gleisfeld (Zürich-Baden railway). Because of their nature, they have been historically difficult to cross, and, as a consequence, the city developed along them, linearly spreading further away from the center. In order to easily overcome these borders, the first Hardbrücke was constructed in 1867, tangentially to the city center. It brought mostly people and horses from Hardplatz to Pfingstweidstrasse and provided access to the Nordwestbahn as well. The New Hardbrücke was built between 1969 and 1972 as a temporary solution - until the construction of the Expressstrassen-Y - to ease the city traffic from north to south. The traffic was so intense that cars directed southwards were diverted to cross further west over the Duttweilerbrücke. With the opening of the West Umfahrung the opportunity to develop a new traffic concept over the bridge was proposed, but the project was turned down eventually. The street was converted from an express-way to a neighborhood street only in the southern part of the area around Bullingerplatz. Over the Hardbrücke the traffic has decreased by 80% in some sections, but still around 80’000 cars pass each day through it nowadays. Despite the recent addition of the tram line number 8, the traffic over the bridge is still mainly car oriented, with a separate lane for busses and a slow-vehicles dedicated paths, but only in the southern part. Here pedestrians and bikes are confined together on a 4-meter-wide lane with a bus station in between.