While infrastructure has substantial impacts on growth that may vary across countries, time, and within infrastructure subsectors (see, for example, Estache and Garsous, 2012, and Dissou and Didic, 2013), infrastructure development can also promote growth spillovers to neighbouring countries (Roberts and Deichman, 2009). Importantly, investments in water supply, sanitation and roads are critical to growth and have benefited the poor in East Asia and the Pacific (Jones, 2004, van der Geest and Nunez-Ferrer, 2011). At the country level, numerous studies have shown that infrastructure development leads to sustained economic growth and is a significant factor for reducing poverty.