The cameras in question are nearly 10 miles before the speedway, on one of the two main roads leading to the speedway.
11E is a 4 lane divided highway with a speed limit of 55 or higher except where it passes through stoplights. Bluff City conveniently has a total of 2 stoplights on 11E, although neither one is really necessary.
The two cameras here, along with many more that have been placed in the region over the past couple of years have only been placed in high traffic areas where the speed limit drops below the normal for a very short distance. Those areas have historically been some of the safest & most accident free stretches of road in the area.
The problem, and the common complaint about the cameras and their placement is that the various law enforcement agencies in the area are focusing on generating income by way of fines rather than focusing on reducing accidents and increasing highway safety.
Disclaimer - I live not just in the area, but less than 1 mile from another of the unnecessary set of cameras. I am also familiar with Bristol Motor Speedway, the cameras in question, and the traffic on race weekend from having provided network/server support to the speedway in the past, including during race weekends.