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
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
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.
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,
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: