[hkarthik]

Network and data infrastructure is also a challenge for self driving cars and has a ways to go. The data produced by a single self driving car can be pretty staggering (I've heard estimates as high as 5 TB/minute). Now think about transferring that much data around a fleet of cars over current LTE wireless data connections.

Even if someone gets it working in a small area, it will take years of investment in network infra to make it truly ubiquitious.

Barring some major technical breakthroughs, I just don't see the current tech that these companies are testing being scalable at the same level as GPS, cellular data, etc.