The first area to look at was rental car return. When you're done with the rental car, you get out at the terminal, and it drives itself, slowly, back to rental car turn-in. When you order a rental car at the airport, it drives itself slowly to the terminal and picks you up at the curb. Then you drive away manually.
The numbers didn't look good. You're competing with minimum wage labor, and the hardware costs too much. That's still the case. Also, back then, everybody was so paranoid about airport security that getting this past TSA would be really hard.
Second area was shuttle buses. Parking lots, campuses, amusement parks - all slow speed applications. Local Motors and Navya are doing this. Navya had a backup driver on their Las Vegas shuttle bus for the first year or so. Not clear if they finally got rid of them. They have several test installations, but it's not clear that they have trustworthy real autonomy. They have a demo route in Switzerland, but "VBSH has in addition hired and trained three attendants who are always also on board the bus during trips." Their CEO was just fired for underperforming.[1] Local Motors does demos, but still seems to be searching for a serious customer. Baidu has a self-driving bus program, and they've built about a hundred of them. Not clear if they need a "safety driver".
It's rather disappointing that even the slow speed shuttle buses on fixed routes are not yet really autonomous.
[1] https://venturebeat.com/2018/12/19/navya-ceo-fired-after-big...
What is hard about self driving cars is we want our kids to be able to ride their bikes on the same streets those cars drive on. Limit self driving cars to just hiways with only other self driving cars and we could have had them 15 years ago and there would be near zero accidents. Dealing with human drivers (who might not be sober), kids, wild animals, and the like is hard. (I'm sure those in self driving cars have a much longer list of things things that are hard)
Autonomous cars are hard because children, and wildlife do not have transponders, and worse have a habit of jumping out from cover right into your path. Killing children is obviously bad. Even though who morally would argue that wildlife don't matter still do not like the damage hitting the wildlife causes to the car.
I can see that this is more future-compatible, the "drone" is smaller than a car, so, when you can lose the driver you will be able to shake off the whole shadow vehicle and have less mass overhead.
Edit: also, PR. The pretty pictures of the obviously driverless vehicle are almost inherently misleading.
Anyone can see anything else?
The unmanned delivery vehicles will be followed by a “shadow car,” which will be driven by a human with the ability to stop or control it.
There was a Silicon Valley startup called Starship Technologies which had a little robot vehicle running around downtown Redwood City sidewalks making deliveries. It was always followed by a guy watching it.