This paper consists of tree principal parts. The first part discusses the problem of safety of Slovak level
crossings, seen through the statistic data, and explains distinctive features identified on the base of comparison with level
crossings operated in other EU countries. The second part deals with knowledge-based approach applied to diagnostics of
electronic/computer-based level crossing installations. In the last part the authors present their methodology which has
been designed and which is to be applied to the level crossing systems of a particular producer and describe possible
architectures of such a system.