This book highlights the latest advances, innovations, and applications in the field of LCA in pavements, bridges, and roadways, as presented by leading international researchers at the 6th International Symposium on Pavement, Roadway, and Bridge Life Cycle Assessment (ISPRB LCA2024), held in Arlington, VA, USA, on June 6-8, 2024. It covers a diverse range of topics concerning assessment of environmental impacts of pavements, bridges, and roadways, including environmental product declarations (EPDs) and use of life cycle assessment (LCA) in design, data, and case studies: LCA methodologies for transportation infrastructure, durability and service life assessments, maintenance strategies to enhance performance and minimize environmental impacts, evaluating the environmental impacts of materials and construction, recycling and reuse of materials, carbonation of concrete, pavement vehicle interaction, life cycle thinking in climate change planning, and climate change mitigation. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster new multidisciplinary collaborations.