Interesting discussion not counting the off topic posts. We made a car trip from Colorado to Texas during the summer to see family. On I25 in Colorado, people including me ran 5-8 over the posted 75, 65 etc. In New Mexico, it was about the same.
When we crossed into Texas it was the Wild West. Ten over seemed to be the norm. So traffic was often moving about 85. In the Dallas area, it seemed that 15 over was the traffic flow during peak rush.
In rural Chaffee, Colorado, we only have three primary through highways. The Colorado Highway Patrol and Chaffee County Sheriff patrol the roads heavily. You can safely drive about 7-8 over. Anything more than that will get you stopped. Colorado Highway Patrol will usually give you ten over if it is in a 65. The lower the speed limit the less tolerance they have. Locals including Sheriffs don't seem to be as liberal.
The Santa Fe/Albuquerque area traffic runs a minimum of 10 over. On rural Interstates and highways most people run a little less than ten over.
In Phoenix area traffic runs about 10 over during rush. But when you get to the outer suburbs it seems that they stop for 10 over and sometimes less.
It appears to me that in most urban areas aggressive driving and changing lanes will get you stopped more than speed because it is more easily seen. If you travel in a pack of 10-20 cars, there doesn't seem to be an issue. It is when a single driver stands out that gets them stopped.
The pattern I see seems to depend on allocation of resources. In urban areas, LEOs are hammered with other pressing issues. In rural areas with less crime, there in stricter enforcement.
