If the business is large enough, you could combine drivers and AI. For example when hauling people to/from airports, the difficult situations usual arise on the

If the business is large enough, you could combine drivers and AI. For example when hauling people to/from airports, the difficult situations usual arise on the city end. The airport and highway part could be "easily" covered by AI. Driver would jump to car closer to the city. Or you could use different vehicles. AI driven minibus for long haul and current driver system for shorter distances. If the system runs smoothly (no extra waiting) and pricing is right, I could imagine using something like this.