From October 1994 to June 1995 the authors executed a project, the so called `Lampremplace' project, in co-operation with Nederland Haarlem, a Dutch constructor and supplier of traffic regulation systems. `Lampremplace', as it is called in traffic jargon, is the maintenance of lights of traffic regulation systems. The research issued here is to find a `good' trade-off between the reliability of the system, and the efficiency and economy of the maintenance operation. In the project a number of maintenance strategies were developed that can be optimised and are hopefully simple in daily use. Field test of the strategies was not carried out in this project. This is the public version of the final report of the `Lampremplace' project. In Part I of the report a theoretical development can be found that leads towards two main maintenance strategies. First, the main research questions are formulated, the assumptions under which the research was carried out are listed, and relevant statistical and computer science notions are discussed. Next, two maintenance strategies are formulated and developed. Finally, optimisation algorithms for the parameters of the strategies are formulated. A prototype that was developed in Pascal is not discussed in this version of the report. Part II presents a formal specification, in the specification language PSF (Process Specification Formalism, of a decision support system for the maintenance of lights of traffic regulation systems. Whereas the first part is focused on strategies and optimisation, the second part is focused on incorporating the strategies and optimisation algorithms in a complete system that can be used by parties that are responsible for the maintenance of road infrastructures. (A)
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