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Life-cycle provisions related to highway structures, including bridges and footbridges, bridge components, signals gantries, road restraint systems, and tunnelsNational Roads Authority. The National Roads Authority's (NRA) primary function, under the Roads Act 1993, was to secure the provision of a safe and 1.1 The NRA DMRB is based on the UK. Highway Agency?s DMRB and adapts it for use on national roads in Ireland through a series of implementation documents. NRA Design Manual for Roads and Bridges. NRA DMRB - Update Alert. Publication Year. 2014. Document Status. Red. Old version of document. Newer versions