The subject of the predecessor projects "Retrofitting I and II" was the planning of necessary retrofitting and/or replacement measures on the bridges concerned. A prototype procedure for calculating optimised retrofit programmes to minimise the overall economic impact of the unavailability or limited usability of bridges in a subnetwork was developed. The methodology was applied to an example with Rhine crossings in NRW between Bonn and Duisburg. In the project, the method was further developed with the aim of applicability to larger sub-networks. The aim of the project was to develop a software prototype with which optimised retrofitting programmes can be calculated.
The task of the continuation project "Retrofitting III" is to transfer the developed methodology into practice. This is to take place within the framework of an initial application for a sub-network with approx. 50 bridges using the present prototype.