AASHTO DS-6, A Policy on Design Standards for the Interstate System (2016), presents the minimum design standards that apply to Interstate highway segments built on new right-of-way and to segments reconstructed along existing right-of-way. The standards are intended for use with A Policy on Geometric Design of Highways and Streets, which supplies the broader geometric design guidance, while this policy fixes the controlling values for the Interstate System. Design values are stated in both U.S. customary and metric units. Changes based on research and practice since the prior edition are reflected in the document. The policy is intended for state highway agencies and for designers preparing Interstate construction and reconstruction projects that must satisfy the national design standards.