Considering increasing passenger numbers, a mobility concept was developed which should raise the attractiveness of the city centre through a faster and more environmental-friendly public transport system. The gigantic urban planning project was resolved by a public referendum in 2002 and was meant to be finalized until 2020. A 2.4 kilometre long city rail tunnel, which is largely located beneath the emperor’s street (Kaiserstraße), makes the shopping mile an exclusive pedestrian zone. At the same time, passengers reach their destination faster, prompter and safer. The second subproject is a planted tramway street between bicycle paths and tree avenues while the car traffic has been relocated to a consistent car tunnel. For both tunnel constructions, special cables complying with the Construction Products Regulation (short CPR) have been demanded.