Turns out it wasn’t just spy balloons…
Since 2017, self-driving cars owned by Chinese companies have traversed 1.8 million miles of California alone, according to a Fortune analysis of the state’s Department of Motor Vehicles data. As part of their basic functionality, these cars capture video of their surroundings and map the state’s roads to within two centimeters of precision. Companies transfer that information from the cars to data centers, where they use it to train their self-driving systems.