There are three significant downsides to Google’s approach. First, the goal of delivering a car that only drives itself raises the difficulty bar. There’s no human backup, so the car had better be able to handle every situation it encounters. That’s what Google calls “the .001 percent of things that we need to be prepared for even if we’ve never seen them before in our real world driving.” And if dash cam videos teach us anything, it’s that our roads are crazy places. People jump onto highways. Cows fall out of trucks. Tsunamis strike and buildings explode.

The automakers have to deal with those same edge cases, and the human may not be of much help in a split second situation. But the timeline is different: Automakers acknowledge this problem, but they’re moving slowly and carefully. Google plans to have everything figured out in just a few years, which makes the challenge that much harder to overcome.

[…]

The deadly crash of Asiana Airlines Flight 214 at San Francisco International Airport in July 2013 highlights a lesson from the aviation industry. The airport’s glide scope indicator, which helps line up the plane for landing, wasn’t functioning, so the pilots were told to use visual approaches. The crew was experienced and skilled, but rarely flew the Boeing 777 manually,Bloomberg reported. The plane came in far too low and slow, hitting the seawall that separates the airport from the bay. The pilots “mismanaged the airplane’s descent,” the National Transportation Safety Board found.

Asiana, in turn, blamed badly designed software. “There were inconsistencies in the aircraft’s automation logic that led to the unexpected disabling of airspeed protection without adequate warning to the flight crew,” it said in a filing to the NTSB. “The low airspeed alerting system did not provide adequate time for recovery; and air traffic control instructions and procedures led to an excessive pilot workload during the final approach.”

Ref: Google’s Plan to Eliminate Human Driving in 5 Years – Wired