It’s not news that the health care systems in many parts of Africa are sorely lacking: There are great needs for more doctors, more medicine and more medical equipment. But a hidden hole in the system for many years has been vehicular: The ambulances, trucks and motorcycles that were meant to help practitioners get aid to their patients were, quite simply, falling apart. And even if you have the medicine people need, it does them no good if you can’t reach them. Andrea Coleman, co-founder of Riders for Health, recognized that problem, and made solving it her mission. For the work that her organization has accomplished, Riders for Health was recently honored with Wharton’s 2015 Lipman Family Prize . Anne Greenhalgh, deputy director of the Wharton Leadership Program , spoke with Coleman about what Riders for Health does, how it works and the challenges of providing health care on a continent where good-quality roads are often harder to come by than good doctors.…