SDCL § 1-44-36: Use of recovered material by Department of Transportation.

The Department of Transportation shall use or encourage the use of the maximum possible amount of recovered material, such as foundry sand, glass, pavement, and rubber recovered from waste tires as surfacing material, structural material, landscaping material, and fill for all highway improvements, consistent with safe engineering practices. The Department of Transportation shall specify the proportion of recovered material that may be used in various types of highway improvements.