Yes, the socially/culturally accepted driving speed is the speed limit plus 10 mph. Driving slower than that is considered rude and imposing. No, a cop will not pull you over or even notice you for speeding less than 10pm over. Unless they are specifically looking for trouble, then they have always legal pretext. It’s a “great” system.
This is the penalty system where I live:
https://online.fines.vic.gov.au/Your-options/Fine-amounts-and-demerit-points
To convert into hamburger units: 11mph over the limit is a $290USD fine. If you do that 4 times in 3 years, you lose your licence.
You can get a fine 2.5mph over the speed limit. However, there’s a small tolerance for the equipment (~1mph). It’s still quite tight.
Is the whole US this lax on speeding?
Yes, the socially/culturally accepted driving speed is the speed limit plus 10 mph. Driving slower than that is considered rude and imposing. No, a cop will not pull you over or even notice you for speeding less than 10pm over. Unless they are specifically looking for trouble, then they have always legal pretext. It’s a “great” system.