Yep, it's speed traps.
I live 1/2 of a mile north of the Moody/Leeds exit (144A/B). I can hear them without any antenna on my handheld! On occasion they are at the Pell City exit near Cracker Barrel, and turn around at the Eden exit to start over. I think this is what you are hearing.
The troopers are at my exit about once a month. The "laser car" parks on the overpass and so far this year they have always been issuing tickets to eastbound traffic. 12-15 troopers are in the speed trap. They go up to the Brompton exit and return to Moody. I have yet to hear them to give out a ticket for 79 mph or less. Always on Saturdays too.
I am the provider for the Moody online scanner. Talladega is this weekend, maybe I should put that frequency in my scanner?