The speed limit on I-5 south of Patterson is 70MPH for vehicles without trailers.here is a brain-storm 4 California.put speed limiters in the cars to,as not to allow them to go over 65 mph.
You would also have to install the limiters on vehicles registered out-of-state which travel our roads.
Anyone with sufficient knowledge of mechanics and electronics can defeat such a system. I am certain that I could.
Retrofitting such a system to existing automobiles would likely result in a fiasco worse than the NOx systems California required to be retrofitted to 1966-1970 models (upon transfer of title). Those were easily defeated.