(AP Photo/Yuri Kageyama) In this May 31, 2018, photo, a car monitor shows a 3D digital map as it's driven through Tokyo streets. Technology companies are racing to develop ultra-precise three-dimensional digital maps that can guide self-driving cars to within inches of where they are supposed to be - a hurdle the industry needs to clear if it hopes to deliver on its promise of widespread use of driverless vehicles.