Detailed design of a series of precast segmental viaducts with overall length of approximately 1 km and spans up to 45m built through an urban environment. The single cell precast segments are typically 2.5m long with an overall top slab width of 16.9m. The top slab is transversely prestressed while the longitudinal prestress was a mixture of internal and external tendons. The decks were all erected using the balanced cantilever form of construction with an overhead gantry.