Self-driving cars have been in development for a number of years. Now they are being tested on roads with other drivers. This is bringing up a lot of discussion about the safety and future for self-driving cars.

On Wednesday morning, executives with the ride-hailing service announced they would expand a pilot program for testing autonomous Volvo XC90s to include operations in its home city. By the afternoon, a top official in California’s Department of Motor Vehicles had issued a warning that Uber did not possess the proper permits for autonomous testing.