I'm guessing the cop had good reason to stop him.
Minimum speed in the fast lane on a Florida Interstate is 80 (not legally, but reality). Cops will not stop you unless you are going over 85 and then infrequently. I average around 82 mph to and from work for years. I get pushed out of the fast lane several times on the drive because I am going to slow.
The middle lane averages 75mph. Someone going the speed limit in either the middle or fast lane is an accident waiting to happen. As far as construction zones go, the ones that slow you down because of barriers, slow you down. Most are unnecessarily too long and not needed (workers way off on the shoulder).
I got a warning recently for going 42mph on an unsigned road. I told the cop I did not see a speed limit sign. He said if you don’t see one the speed limit is 30mph. Here’s the kicker, the area wasn’t residential, it was completely rural. No houses, children, pediatrician crossings, etc... nothing but trees for as far as the eye could see. 60mph would have been safe. The cop was hiding in the woods on a completely deserted street hoping to catch someone in a speed trap that serves no one but the county coffers. Most speed traps are not for safety, they are revenue streams.
I would bet that 80% or more of the drivers were going 76mph or more. However, that is not saying the guy did not deserve what he got. The man was a complete idiot and the Darwin rule solve his problem.