Don't forget the orientation
The person was pushing a bicycle across the street, thus the bicycle and its shiny hard metal surfaces was broadside on to the car's sensors, giving the best possible chance for detection.
A cynic might think that the problem is data processing. If you give the car enough sensors to give a detailed and accurate picture of its environment, the computers needed to interpret all that information in real time won't fit in a car (or maybe cannot be built).
Biting the hand that feeds IT
