The speed limits are not unrealistic, however, the placing of the sign is questionable, especially if you are traveling South on 133 headed to Valdosta. The officer places his position to the side of a curve, approximately 100 feet off of the shoulder, which comes off of a hill where the speed limit is changing from 55 to 45 mph. He tags you with his radar as you are slowing down but have yet reduced your speed to 45 mph.
Then, the officer, allows you to proceed across the one and only cross-road in the middle of the area, at which point he pulls out and follows you as exit the "City".

At this point, you do not realize he is actually "after" you or anybody else. Then, when you are outside the City Limits, on come the lights and he will make sure you know that Is you he is "pulling".

Final result: You are presented a ticket for "speeding" and a ticket for "failing to yield to an emergency vechicle".