What we have learned to data from experimental concrete shoulder projects. Paper prepared for the 52nd Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1973.

This paper summarizes performance to date and examines design details developed from experimental projects on concrete shoulders which have been used on urban expressways for some years. It makes recommendations for maximum safety design and economy, thereby suggesting areas for further study in the design of the concrete shoulder- roadway system.