Describes a new design approach that allows the designs of reinforced concrete structures for a defined lifetime related to limit state formulations. This has been used for a bored tunnel construction in The Netherlands (the Westerschelde project). The whole construction consists of two different elements, the ramp and the bored tunnel itself (reinforced concrete and steel members). The tunnel has two tubes with an external diameter of 11.0 m and a length of 6.5 km. All elements have been designed according to the new performance-based durability design procedure.