Millions of people die on our roads each year. Hundreds of children are killed as they try to get to school each day. Road deaths threaten to overtake malaria and HIV in how many lives they take around the world, particularly in poorer countries.

Sheena McDonald visits some of the world's most dangerous roads in Kenya and Costa Rica to find out why the death toll in developing countries is rising, when the solutions to road accidents are so simple. Kenya's poor record improves and then falls again as new transport ministers come and go; while Costa Rica struggles to implement the road safety plan it so confidently launched over 5 years ago.

When there's not much money, should reducing road deaths be a priority? The Millennium Development Goals push countries to work hard to improve the mortality rates for children under 5, but there are no goals to stop those same children being knocked down when they start school.

Sheena McDonald, who was nearly killed by a speeding police car just over 10 years ago, visits accident blackspots, meets victims and people campaigning for better road safety and challenges those in power who don't believe it's important enough.