Building a Road Map for the Self-Driving Car

How do you create a map showing every road in the United States, with the precise location of every stop sign, all the lane markings, every exit ramp and every traffic light — and update it in real time as traffic is rerouted around construction and accidents?

"Building a Road Map for the Self-Driving Car" is from the March 02, 2017 Technology section of The New York Times. It was written by Neal Boudette and narrated by Kristi Burns.