what are the logistics for this? There were 263.6 million cars in the US in 2015 (source: https://en.wikipedia.org/wiki/Passenger_vehicles_in_the_Unit...), so I'm sure there's even more today. I could see having manufacturers install speed governers in new cars, but how would you coordinate installing in all the "old" cars? There'd be a period (probably years) where some, but not all cars don't have that limitation.