Section 4VAC50-20-45, Hazard Potential Classifications Based on Low Volume Roadways, Paragraph D, describes the applying the term “limited use” and assigning a low hazard potential classification despite the presence of the roadway.  The second sentence refers to roadways “…located either across or below an impounding structure…”  The phrase “below an impounding structure” is not used elsewhere in the regulations.  Please consider clarifying if the regulations are referring to all roads downstream of the impounding structure, or if “below an impounding structure” refers to a roadway located on or adjacent to the toe of the impounding structure.