From MIT’s Technology Review:

Among other unsolved problems, Google has yet to drive in snow, and Urmson says safety concerns preclude testing during heavy rains. Nor has it tackled big, open parking lots or multilevel garages. The car’s video cameras detect the color of a traffic light; Urmson said his team is still working to prevent them from being blinded when the sun is directly behind a light. Despite progress handling road crews, “I could construct a construction zone that could befuddle the car,” Urmson says.

The deeper Google’s Self Driving Car team digs into the problems associated with driverless cars, the more they realize about the incredible complexity of the space. That said, I still think this tech is coming, albeit with an extremely slow rollout under extremely controlled conditions.