Advanced TraÆc Management Systems (ATMS) and Advanced Traveler Information Systems (ATIS) are promising technologies for achieving eÆciency in the operation of transportation systems. This paper presents a simulation based laboratory environment, MITSIMLab, designed for testing and evaluation of dynamic traÆc management systems. The core of MITSIMLab is a microscopic traÆc simulator (MITSIM) and a traÆc management simulator (TMS).