The newly developed FREQlO integrated system of freeway c rridor simulation models is described with emphasis on traffic simulation, freeway improvement strategies, measures of effectiveness, and traveler responses. The major accomplishments have been to combine the previously developed entry control model, an exten ively modified on-freeway priority model, and a newly developed common menu-driven interactive interface into an integrated system of models to extend the types of traffic management strategies that can be evaluated for a freeway corridor. The FREQIO ystem of model enables the user to analyze design improvement. implementation of an HOV facility implementation or normal and pri rit)'entry control, or implemenl'ation f time-varying capacity reduction si. tuatio. n uoh as reconstruction activities or freeway incidents. The extensive modifications that have been made to the on-freeway priority model include refining the procedure for traffic simulation, adding many new features uch as user-supplied emis ion and fuel mies, and developing a new method for modeling the arterial and patial response to reflect current policies that HOV facilities be con idered as lanes added to the freeway. This system of models has received extensive testing and has been applied to freeway corridors in several urban areas in California.

During the past 20 years, the Institute of Transportation Studies at the University of California at Berkeley has developed and applied a sequence of freeway simulation models for the evaluation of various design and operational improvements. These models have been used by researchers and professionals both in the United States and abroad. Interactions with model users and experience in educational programs have led to continuous improvements in these models. Numerous reports are available describing these earlier developments (J-20). A significant advancement in this modeling effort has been made as a result of a recently completed 2-year research and educational program sponsored by the California Department of Transportation and the FHW A. The major accomplishments have been to combine the previously developed entry control model, the extensively modified on-freeway priority lane model, and a newly developed common menu-driven interactive interface into an integrated system of models to extend the types of traffic management strategies that can be evaluated for a freeway corridor. The purpose is to describe the newly developed FREQlO integrated system of freeway corridor simulation models with emphasis on traffic simulation, freeway improvement strategies, measures of effectiveness, and traveler responses. A comprehensive final report of the research program (21) and two previous research reports (9, 17) are available for in-depth coverage of each element of this newly developed system of