The biggest auto parts supplier says there are 3 big hurdles holding back self-driving cars

John Dolan, principle systems scientist at Carnegie Mellon’s Robotics Institute, previously told Business Insider that urban canyons have been a challenge for self-driving cars.

“If you’re trying to do urban driving and depending on GPS to a large extent, then when you get into areas where there are a lot of tall buildings it’s hard to receive the GPS signal and you’ll have drop outs,” he said.

Stepper said Bosch is working on monitoring the “ego motion” of the vehicle to combat that problem.