1. AASHTO TP81. 2010. “Standard test method for determining aggregate shape properties by means of digital image analysis”. Washington, DC: American Association of State Highway and Transportation Officials (AASHTO).
2. Three-Dimensional Surface Texture Characterization of Portland Cement Concrete Pavements
3. Evaluation of image analysis techniques for quantifying aggregate shape characteristics
4. ASTM Standard E965. 2006. “Standard test method for measuring pavement macrotexture depth using a volumetric technique”. West Conshohocken, PA: American Society for Testing and Materials (ASTM) International. DOI: 10.1520/E0965-06
5. ASTM Standard E1960. 1999. “Standard practice for calculating international friction index of a pavement surface”. West Conshohocken, PA: American Society for Testing and Materials (ASTM) International. DOI: 10.1520/E1960-99