On I40 just east of exit 116, there has been an area of high enforcement. Today, i saw for the first time, a portable overhead gantry over both lanes that appeared to monitor speed and possible photo license plates.
I saw whats likely the same thing on I-40/85 eastbound exit 138 a couple weeks ago. Temporary overhead gantry placed about 1/2 mile before the exit. Troopers were lined up on the entrance ramp waiting to ruin people's day.
This also helped me confirm that the NO TRUCKS OVER 3 AXLES IN LEFT TWO LANES rule is not enforced at all 
It genuinely amazes me when police will blatantly ignore something like no trucks in the left lane, a serious safety issue that impedes the natural flow of traffic, causes speed differentials, causes traffic to pass on the right, abrupt braking, lane weaving, etc.
… but have no problem pulling someone going 80 mph in an underposted 65 mph wide-open flat 8 lane freeway. Is it about true safety or is it revenue?
This reminded me of when I drove the US-74 Monroe Bypass months back, and witnessed county police parked on every single on-ramp, and hidden at the emergency pull-offs by the toll gantries. I drove about 10 miles each way (northern portion) and saw over 10 police in various spots throughout the round trip. I kept my cruise control right at 5 mph over, no more.