As Uber and Didi's 99 grapple with driver shortages and high fuel prices in Brazil, Taxi.Rio, an app developed by the Rio city government, is gaining riders (Charlotte Peet/Rest of World)

Charlotte Peet / Rest of World:As Uber and Didi's 99 grapple with driver shortages and high fuel prices in Brazil, Taxi.Rio, an app developed by the Rio city government, is gaining riders  —  Rio de Janeiro's Taxi.Rio app has caught up to Uber's technology, now it has a few other aces up its sleeve.  —  • RIO DE JANEIRO, BRAZIL

As Uber and Didi's 99 grapple with driver shortages and high fuel prices in Brazil, Taxi.Rio, an app developed by the Rio city government, is gaining riders (Charlotte Peet/Rest of World)

Charlotte Peet / Rest of World:
As Uber and Didi's 99 grapple with driver shortages and high fuel prices in Brazil, Taxi.Rio, an app developed by the Rio city government, is gaining riders  —  Rio de Janeiro's Taxi.Rio app has caught up to Uber's technology, now it has a few other aces up its sleeve.  —  • RIO DE JANEIRO, BRAZIL