Traffic accidents that result in deaths are individual tragedies that also hurt a country’s economy. A new report from the World Bank says these deaths are a barrier to economic growth in developing countries. The report is one of several reports showing that investing in road safety in low- and middle-income countries could raise national incomes. Worldwide, about 1.25 million people die in traffic accidents each year. The report says about 90 percent of those deaths happen in developing countries. The World Health Organization says that traffic accidents are the leading cause of death worldwide for people between the ages of 15 and 29. That includes crashes that kill people who are walking, riding bicycles or other small vehicles.