Where I live travelling at that speed will get you passed by every cop and state trooper driving on the same road. A lot comes down to local norms and enforcement.

In Alabama on the interstates and highways the rule of thumb is: "8 you're great, 9 you're mine."

There are different norms in the U.S. - where I am- generally 5 mph over the posted speed on side roads, and ~9 over on interstates / highways.

You are very unlikely to get stopped for either of those.

Another commented using an example of 8 and 9, but here it’s “9 you’re fine, 10 you’re mine”.