This ""Geotechnical Special Publication"" contains 16 papers addressing a variety of current issues in the testing and modeling of pavement materials and structures. The papers in this ""GSP"" include 11 papers that were presented at the Symposium on Pavement Mechanics and Materials at the Inaugural International Conference of the Engineering Mechanics Institute (EM08) held May 18-21, 2008, in Minneapolis, Minnesota. Topics discussed include: asphalt materials; hot mix asphalt; asphalt pavements; and, concrete pavements. Also included are research papers with the most recent findings from four National Science Foundation research projects. This publication is invaluable to geotechnical engineers, pavement engineers, and all those involved in the field of pavement mechanics.