Despite strong advocacy, the UN Decade of Action for Road Safety 2011 2020 is ending with most low and middle income countries LMICs no closer to the Sustainable Development Goals target of reducing traffic mortality by half. ...We estimate effects for six countries that span all developing regions: China, Colombia, Ethiopia, India, Iran, and Russia. We find relatively large benefits 27 reductions in road traffic deaths and DALYs from speed control in all countries, and about 5 20 reductions due to other interventions depending on who is at risk in each country. ...