Do you? Are you prepared if the pedestrian darts into the road?
Wrong question. Context is that humans can determine from context the likely objects which could dart into the road. To that you said it doesn't matter, just that if anything does dart, Google cars are likely to be better.
After that you don't get to ask a human if they also slow down always, because the human, being human, can determine the likely objects which could dart into the road.
Really, it seems like you wont be happy unless it drives exactly like a human does, which is a terrible idea given the rate of auto deaths every year because of bad decisionmaking, poor reaction speed, and unsafe driving.
Really, it seems like you would be happy if it drives exactly the general state of software bugginess in the world today, which is a terrible idea given the everyday goof-ups because of rushing out releases, regulatory ignorance, lobbying legislators to keep out software makers of all trouble irrespective of consequences, and unsafe coding.