Liability has prevented many technological upgrades to become widespread in the general aviation market, for example. Sure the operating scenario of a cropduster is totally distinct from the one of a major airliner which enables a lot more automated controls due to the IFR support on major airports. So, unless infrastructore to support autonomous driving becomes not only widespreaad but also protected from vandalism as it usually is in commercial airports and military bases, I won't hold my breath for a full-autonomous car, truck or bus to become effectively viable. Autonomous operation requires a more controlled environment, and some human override might not be out-of-question if need arises.
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