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The Subcommittee on Design is one of AASHTO’s largest and most respected committees, consisting of the leaders in highway design from all 50 states, the District of Columbia, and Puerto Rico. The Subcommittee acts as the national voice and the leading source of innovation and technical guidance for transportation design projects and programs across the country. The Subcommittee's annual summer meeting provides a forum for the exchange of practices and experience in the field of transportation facility design.

The primary role of the Subcommittee's eleven Technical Committees is the development of technical publications that are recognized throughout the world, including the AASHTO Green Book (Policy on Geometric Design of Highways and Streets), the Roadside Design Guide, the Bicycle and Pedestrian Guides, and the recent Guide for Achieving Flexibility in Highway Design.

Subcommittee and Technical Committee members also participate on national research projects and comment on proposed federal regulations, ensuring that the State DOTs’ voices are heard in all aspects of transportation design.