If every vehicle on the road is autonomous, signals are not required. The only exception would be walking crosses but actually the cars should see you and wait for you.
When I say signals, I don't necessarily mean traffic lights.
Would traffic flow continuously from every entry point to the intersection in an "interleaved" manner (setting aside the complexifier that is pedestrian traffic)? Or would there still be a "signal" (visual, over the network, or otherwise) which blocks some vehicles while others pass through? Or, perhaps, the configuration of intersections will change so significantly that this conception of an intersection will be rendered irrelevant?
