Traffic Software Integrated System

FHWA's new Traffic Software Integrated System (TSIS) provides a modern, state of the art environment for FHWA's family of TRAF traffic engineering, analysis, and simulation tools.

TSIS was originally developed as a shell application that provided a character-based, menu-driven interface to many of the TRAF family of traffic engineering tools including NETSIM, FRESIM, GTRAF and others. Versions 1 through 3 were DOS applications and were available through McTrans, distributed with NETSIM and CORFLO.

FHWA's Turner-Fairbank IST (Intelligent Systems and Technology) Division has developed TSIS Version 4. This latest version of TSIS is a Windows 95-based application and provides all of the functionality of the older DOS TSIS, and more:

  • An integrated, user-friendly, graphical user interface and environment for executing the TRAF models and other formerly DOS-based traffic simulation, optimization and assignment models as true Windows applications.
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    • CORSIM: FHWA's new micro-simulation model. The heart of TSIS, CORSIM is a sophisticated micro-simulation model based on the older FRESIM and NETSIM models. Many other enhancements have also been introduced to many of the internal modeling algorithms. CORSIM simulates a real-world traffic network by moving individual vehicles across a combined surface street and freeway network using accepted vehicle and driver behavior models and simulating various traffic control devices.
    • TRAFVU: an output processor for animating CORSIM runs. Simulation of a system provides the user with statistical data and a graphical representation of the system. The TRAFVU application provides the user with both, and is the showcase of the TSIS environment. This graphical processor replaces the GTRAF processor that formerly accompanied NETSIM. TRAFVU is a powerful graphical tool providing the user with an intuitive interface to the simulation results. TRAFVU has been well documented by a number of sources reflecting its usability and its utility in demonstrating simulated transportation improvements.
    • ITRAF: a graphical CORSIM input processor, a TSIS add-in developed by Oak Ridge National Laboratory, available separately.
    • PASSER IV: Texas Transportation Institute (TTI) latest Signal Optimization Application, providing network-wide signal optimization. TTI is currently repackaging PASSER IV for TSIS and it will be the first product to be added to TSIS by a third party. It builds the network from the active CORSIM input file, and optionally modifies the CORSIM input file automatically with new signal timings. This proof of concept demonstrates the ability of TSIS to integrate different types of traffic engineering tools allowing the tools to interact with CORSIM. PASSER IV is not delivered with TSIS 4, but will be available separately.
  • An easy to use, menu driven interface (dialog boxes, toolbars, on-line help, etc.)
  • An expandable system, providing facilities to integrate different packages allowing interaction with CORSIM on several levels.
    • Other tools can actively interact with CORSIM during simulation execution.

    • Tools can passively interact with CORSIM between simulation runs (such as the PASSER IV demonstration).

  • Powerful scripting ability allowing many test cases to be run automatically and unattended. Simulation execution results as well as simulation output can be logged to disk for post-run analysis.
  • Extensive on-line help for CORSIM, TRAFVU, and TSIS.
  • A Programmers Applications Interface (API) allowing programs to be added as TSIS components (by the component author).
  • A common repository is in development to support the data requirements of all traffic models and simulation systems. As the TRAF family of tools evolves, they will be able to operate from a singularly defined input dataset. This dataset is important in minimizing the redundancies currently involved throughout the traffic analysis process.

TSIS is being designed and developed as an open architecture, other tools will be available soon from FHWA as well as other third parties. One of the major goals of the TSIS initiative is to provide a user interface that is intuitive and a system for integrating the component models. This will make FHWA's TRAF tools available to many traffic engineers who would like to use the models don't because they don't have the time to learn how to operate the models and interpret their cryptic results. Of those practitioners that already know the model, these tools will ease the burden of creating the traffic networks, which in the past has been very labor-intensive and error-prone. Future versions of TSIS will include the ability to import GIS, USGS, CAD, and other digital mapping information to make it even easier to use the models.

The new TSIS represents a significant advancement in the use of simulation tools for the practitioner. The advanced functionality it provides are only available using Windows 95 or Windows NT 3.51 (or later). The minimum PC platform is a 486 (33MHz) with 8 Megs of RAM, but the suggested platform is a Pentium class computer with 16 megs (or more) of RAM. As is the case for most of today's software, the better class machine provides more satisfactory performance (in terms of fast execution times).

For additional information on TSIS and its components, see our web page at:

http://ops.fhwa.dot.gov/trafficanalysistools/corsim.htm /