The Federal Highway Administration (FHWA) Research and Technology (R&T) Program furthers the FHWA Office of Research, Development, and Technology’s goal of ensuring transparency, accessibility, and responsiveness of R&T for all stakeholders.


This report examines how FHWA’s investment in adaptive signal control (ASC) research and increasing awareness of ASC technologies has affected the development and deployment of these technologies. This report should be of interest to engineers, practitioners, researchers, and decisionmakers involved with the research, design, performance, and management of traffic signals.