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V.4.1.3Amendment No. V-l/91 (Jan.)4.1.3 Limit state designHighway structures and railway bridges shouldnormally be designed on the basis of the limit statephilosophy contained in BS 5400 - Steel, Concrete andComposite Bridges. However the provisions of some parts of BS5400 are not relevant to Hong Kong conditions, and for these,the recommendations of this Chapter, or other appropriatecriteria, should be substituted.All undated references to BS 5400 refer to thecurrent edition except, BS 5400 : Part 2 which shall be aspublished in Appendix A to the United Kingdom Department ofTransport Departmental Standard BD 37/88.4.1.4 Permissible stress designPermissible stress design methods may be used forthe design of highway structures. To ensure that such methodsare compatible with normal methods and that proper allowanceis made for conditions peculiar to Hong Kong, the prioragreement of CHE/Str. should be obtained to a statement ofdesign methods and assumptions for any highway structuresdesigned by permissible stress methods.4.1.5 Railway bridgesBefore the design of any highway structure crossinga railway track, or of any railway underbridge, is commenced,the requirements of the appropriate railway authority shouldbe ascertained. Preliminary and detailed drawings, withcalculations if required, should be referred to theappropriate railway authority for comments. The approval ofthe appropriate railway authority should be obtained beforeany work is undertaken.In the absence of specific comment, the contents ofthis Chapter should be deemed to apply to railway over - andunder-bridges as well as to highway structures.