TSIS is an integrated modeling environment that enables users to conduct traffic operations analysis. Built using a component architecture, TSIS is a toolbox that allows the user to define and manage traffic analysis projects, model traffic networks, create inputs for traffic simulation analysis, run traffic simulation, and interpret the results of those models.
CORSIM is a microscopic traffic simulation capable of modeling surface streets, freeways, highways, and integrated networks, including segments, weaves, merge/diverges, and intersection:stop/yield sign, traffic signals. It simulates traffic and traffic control systems using research-backed and established vehicle and driver behavior models.
According to the Federal Highway Administration (FHWA), TSIS-CORSIM has been used by FHWA for conducting research and applied by thousands of practitioners and researchers worldwide over the past 30 years, embodying a wealth of experience and maturity. Volume 4 of the Traffic Analysis Toolbox (CORSIM Application Guidelines) is available on the FHWA traffic analysis tools home page