Today the best solution for bridge modeling is OBM (Open Bridge Modeler). It allows a very accurate modelli,g of the bridge in an easy way as it understand the way to build a bridge and allows a non 3D specialist to quickly create a model. The main problem concerning your questuion, is that IFC for bridges is not yet fully defined. only a very simple scope has been agreed and it does not allow to transfer data with correct entities. For that reason, IFC is not yet specifically supported by OBM, and we have to use either connect Ustation or AECosim for IFC transfer. As the ccuracy that you need is no more than 15mm, it is not sure id it will be the best solution. All will depend on the type of bridges you want to model, if thay are currently supported by OBM, you will relly improve your input time.
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