The posted speed limit on highways in the urban Chicago area is 55 anyway. ( go only 55 and a trucks will eat your lunch)
Montana for quite a few years had an official speed limit of 55 outside cities.
If stopped driving a “safe speed” above that limit, the LEO collected an on-site “fine” of $5 and send you on your way. No points or record.
We called it the speeding fee.