My name is gabriel wolf. Thank you for a very interesting presentation. I understand that every selfdriving car has to know where it is at any time. Is it necessary for others . My question is, do self driving cars have to be tracked . That is what i think i understood him to say. They have to be tracked and be connected and there ways they will be tracked in that sense. Maybe mark or randall, do you have an answer to that . Publicly the way the current manufacturers envision this, they want to focus on Sensor Technology so there will be a gps receiver so the car will know where it is relative to other things. The sensors are there doing. You will be able to pull up a screen and see where they are. I dont think they will know where another selfdriving car is. I dont think thats necessary. Tracking is not a part of the technology that is being developed by any of the companies that i know about. Question at the back . My name is Kathleen Shannon from the university of virginia law schoo