The problem with all self-driving cars looking alike
Have you ever seen a sea of yellow cabs, all of which seem indistinguishable from each other?
It used to be that if you booked a yellow cab for picking you up at a busy airport or similar venue, the odds were that a slew of other yellow cabs were also vying for picking up passengers there too. As such, you would have a tough time trying to figure out which among the multitudes of yellow cabs was the one designated just for you.