[jcdreads]

Drivers in most U.S. states (I can only speak for VT, PA, and MA) are required to carry liability insurance in order to drive legally. The amount varies.

Robot drivers are a new and unproved technology. After not too many years I'd expect that they will cause way fewer accidents per mile driven than human drivers.

[protomyth]

Add that there is not a whole lot of case law on robot driven vehicles to understand how far the accident will go legally (unknown expense for an unknown number of parties)