NETSIM was originally developed under the name “Urban Traffic Control System” (UTCS-I) in the early 1970s.
This program evolved under the direction of the Federal Highway Administration (FHWA) and was later renamed NETSIM (abbreviated for NETwork SIMulation).
Over the years, FHWA has provided significant funding for the development of TSIS-CORSIM and its various components.
CORSIM continues to undergo further development, and is currently maintained by the University of Florida's McTrans Center.
CORSIM input files can also automatically be generated by the Highway Capacity Software (HCS) and other third-party products.