This manual offers highway engineers a comprehensive set of guidelines to assist and simplify the process of designing small bridges and culverts. These structures are an essential part of every road network. They are far more common than large bridges and are simpler to design and construct. For the purposes of the manual, 'small bridges' are defined as single or multispan structures with individual spans no more than 12m long, i.e. taking one span to bridge a two-lane highway with shoulders, or two spans to bridge a dual carriageway.

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