Poorly posted and unreasonable speed limit on a 4 lane highway through McKenzie TN. I had a recent trip to Millington TN and drove hwy 79, which runs through McKenzie, I got an automated speeding ticket going and on the return trip, which averaged about 12 miles over a 40 mile an hour speed limit on this 4 lane hwy. Had no idea the speed limit changed or where it changed. I will absolutely avoid McKenzie and will be on the lookout for indications of this kind of speed trap. Seriously, in this area the speed limit is completely setup to generate funds. The speed limit is unreasonable, the conditions are not made obvious to anyone driving through this area, and furthermore, the authorities absolutely know, that on average people are going to go at least 10 MPH over limit, due to being unaware of the change in speed. I am curious as to how much money is generated from this speed trap. I would bet it’s a lot!