North Carolina traffic observation
While driving in North Carolina along highway 49 I noticed some interesting traffic regulation markers a few miles maybe a hundred miles north of Charlotte there was a cautious sign that started flashing that traffic was entering NC highway 49. when the vehicle entered the highway the lights would stop flashing. I proceeded on further north I entered a town where the speed limit is 55 miles an hour. A sign appeared that told you it was going to be 35 miles an hour soon. A few thousand feet later it said 35 mph in 1,000 ft and then there was another sign that said in a hundred feet it's going to be 35 mph and then a 35 mph sign appeared. I think this is a very astute marking.