This presentation discusses the planning and construction of urban transportation infrastructure projects. It covers the key constraints of space, time, existing utilities, environmental impacts, safety and cost. It then outlines various materials used like concrete, metal and composites. The main construction techniques discussed are for the superstructure, including span-by-span construction using precast girders, segmental construction and balanced cantilevering. Substructure techniques include bored piles, driven piles and diaphragm walls for different soil conditions. The presentation provides an overview of innovative approaches needed to complete large urban transportation projects under the common constraints of dense urban environments.