The example above is bad but not by much. In the parts of NY outside the city, we have 65mph roads (state max speed limit) between large areas and 55mph roads b

The example above is bad but not by much. In the parts of NY outside the city, we have 65mph roads (state max speed limit) between large areas and 55mph roads between smaller areas. Doing 10 over in both is common with speeds being 65 and 75 respectively. Doing 15 over in a 55 is safe in many areas that I have driven and is 70mph, which is a safe speed to most states. Now, at 71 mph, you officially trigger the 15+mph rule mentioned to be a super speeder. Based on anecdotal experience from numerous trips between NY and Ohio, I would estimate that minimum 1 in 5 cars are doing 80+ in a 65. So, at least 20% by my obviously flawed and biased observations. For an actual estimate, in 1988 during the national 55mph speed limit era, an observed 85% of drivers in NY were above the speed limit. For more context, I have paced many law enforcement vehicles (usually state troopers) doing 10 over with regular traffic.