The choices developing countries maketoday in building and expanding transport networks willirreversibly shape development for the next century. That iswhy urgent steps are needed to ensure that transportdevelopment avoids locking in carbon intensive or high-riskpatterns. While investments in urban planning and publictransportation pay off over the long term, they also entailhigh up-front costs, making it essential to scale up supportfrom the World Bank Group and other internationalinstitutions. The commitment to achieving zero net emissionsby 2100 made at the Paris climate negotiations cannot beachieved without radical changes in how cities grow, andtransport planning must be part of green growth strategies.Furthermore, climate-related issues such as food security,extreme weather events, and the health impacts of urbanpollution have ties to the quality, affordability, andavailability of affordable transport in both rural and urbanareas. With many cities in developing countries only nowplanning transport infrastructure, this is the ideal time toensure that transport planning incorporates climate-smartand low-carbon priorities.