US Highway 81 near South Side of City
Officer sits in a truck parking lot a mile south of the Highway 7 overpass of Highway 81. Highway is a wide four-lane, well-marked, well-lighted, and low density commercial traffic. Speed limit is 40 mph. A more appropriate speed would be 45 or 50.
The enforcement in irregular but not uncommon. When it occurs, an officer will write tickets for hours at a time. I suspect most tickets are for speeds from 45 to 50 mph.
Underposting speed is typical of Duncan’s approach to speed enforcement. Much of the city is posted at 25 mph. This is in fact the "default" speed if there is no posted limit.