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The versions are distinguished by the degree of rear steering and actuator for the rear steering rack, with the earliest version using a passive system to steer the rear wheels ("HICAS"), an intermediate version using a hydraulic actuator ("HICAS II"), and a later version using a hydraulic or electric actuator with additional programming ("Super HICAS").
The other big change for GM, of course, is the October accident involving one of Cruise’s self-driving Chevy Bolts in San Francisco (in which a woman was dragged underneath the car), and the ...