The differences from state to state are typically minor and not incompatible How can you say that when not all states have even enacted legislation to regulate

The differences from state to state are typically minor and not incompatible How can you say that when not all states have even enacted legislation to regulate self-driving cars? https://en.wikipedia.org/wiki/File:Self_Driving_Cars_Legalized_States_in_USA.png https://en.wikipedia.org/wiki/File:Self_Driving_Cars_Legaliz... Even minor changes between states are expensive for automakers to manage, and it's bad for consumers if some manufacturers choose to certify their cars for certain states -- you could end up buying a car that you not only can't legally take to another state, but the car will refuse to go there at all to avoid manufacturer liability.