Pavements and Materials: Testing and Modeling in Multiple Length Scales contains 18 peer-reviewed technical papers from the Pavements and Materials: Characterization and Modeling Symposium. This symposium was part of EMI 2010, held in Los Angeles, California, August 8 11, 2010. The areas of research that are included in this special issue are characterization and modeling at asphalt mixture component scale; modeling at asphalt concrete laboratory specimen scale; and characterization and modeling at large or pavement scale. Proper characterization and modeling of pavements and roadway materials are often extremely challenging due to the existence of significant material heterogeneity at different length scales and the complexity and variability of damage and distress at a minute scale. Therefore, testing and modeling at multiple length scales can be ideal tools to gain accurate insight into the mechanisms and factors that affect the performance of mixture and structure scales. This special publication addresses the current advances and ongoing efforts in multiple length scale research in the area of pavement materials, mixtures, and structures. Pavement materials and design engineers and researchers will benefit from the multiple length scale characterization and modeling techniques and methods presented in this publication.