I don't know about where you are, but in this state you will not get a ticket for obstructing traffic if you are traveling at the speed limit. You can get one for traveling 5 over, maybe 1-2 over. We make a lot of money from visitors that think 5-10 over speed limit is OK because the number is a minimum speed. Oklahoma is zero tolerance for all posted speed limits over 55 mph.
However, I've gotten 15-20 over with highway hypnosis on lonely two lanes, and an oncoming trooper running his radar (and probably also cruising 80 mph) would note the high closing speed and just flash his lights to wake me up to how fast I was going.
FWIW, Arkansas is also a zero tolerance state. Kansas, the residents all run 5-10 over. Missouri, all of the driving behavior is weird, but only out of state drivers venture for more than 5 over. Two of my brothers have arrest warrants out for failure to appear on tickets for Michigan driving on Missouri interstate highways.
I'm from Michigan, where normal traffic flow was 10 mph over on rural highways, 15+ on urban freeways, and there was a section of I-94 between Benton Harbor and Indiana where the air patrols would not all out any car going less than 90 mph because there were enough of those to keep the guys on the ground busy.
So rules and culture vary quite a bit state by state.