You white people have a funny sense of humor . EDIT Why are you guys down voting me ? I was laughing my ass off in the car waiting for my gf to finish grocery shopping . You can ' t take a compliment ? <| sep |> He ' s a huge supporter of space exploration and such , so please everyone chill out and give him a chance <| sep |> I think it ' s to determine exact routing through the network . You could do that via facial recognition if the cameras have good enough resolution but I dunno if TFL are allowed under privacy rules . This way it ' s all anonymised . Google does the same via a third party to stick traffic reports on google maps they grab data from all the androids moving around and use algorithms to filter out people like emergency vehicles and parcel delivery .