I’m thinking the conservative approach in this context is a shortcut to solving all of the problems. For example, hitting the brakes at any unrecognized object keeps the passengers safe, and is a shortcut in that the recognition models for that particular object don’t have to be ironed out. Or, selecting a test city like Chandler, approx 60 years old, having the signal pole and crosswalks positioned at the same offset from every intersection is in itself a shortcut. That tech will never work in The Hollywood Hills, for example.