Traffic stands still in Nairobi. People in Kenya's capital don't like getting into cabs driven by strangers. They prefer to call drivers they know or who their friends recommend. Goran Tomasevic/Reuters/Landov hide caption

itoggle caption Goran Tomasevic/Reuters/Landov

Seattle's government has given early approval to caps on ride-share companies such as Uber. Here, Peter Faris, whose company's drivers use Uber to find customers, holds a smartphone with the ride-sharing company's app in Washington, D.C. Paul J. Richards/AFP/Getty Images hide caption

itoggle caption Paul J. Richards/AFP/Getty Images
Spencer Platt/Getty Images