What sets the 1:2 slope in rural construction?

• A. Control line set by normal shoulder point whether or not shoulder gutter is used
• B. Elevation of the grade line over the entire length
• C. Soil type and moisture content
• D. Uniform slope dictated by project geometry

Answer: (A)

The 1:2 slope is defined by a control line anchored at the normal shoulder point. That control line sets the limits for where earthwork can cut or fill, producing a consistent one vertical to two horizontal side slope. The shoulder gutter is a drainage feature, but it doesn’t change this geometric reference—the slope is dictated by the control line from the shoulder point. Elevation of the grade line, soil type/moisture, or generic project geometry influence other aspects, but the specific 1:2 side slope comes from that shoulder-based control line.