The Traffic EXperimental Analytical Simulation (TEXAS) Model for Intersection Traffic is a microscopic single-intersection vehicular traffic simulation model of an at-grade intersection or diamond interchange.

The TEXAS Model is available for Windows X86 and Linux X86 systems. The user interface is written in Java and the model is written in FORTRAN.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Source code is available through the GNU Public Use License.

The TEXAS Model was developed by the Center for Transportation Research (CTR) at The University of Texas at Austin (UT). The initial development effort started in 1968. The TEXAS Model was originally released in 1977. Several additional projects at CTR added enhancements and new features. The Texas Department of Transportation and the Federal Highway Administration (FHWA) provided funding for the development efforts at CTR from 1970-1993. FHWA provided funding for additional enhancements by CTR in 2004-2005 and by Rioux Engineering in 2004-2008.

Dr. Clyde E. Lee was the faculty member who conceived the idea of simulating traffic flow through an intersection. He initiated the first development efforts and supervised several ensuing research projects.

Dr. Thomas W. "Tom" Rioux, a graduate student at the time, became the leader of the team that developed the TEXAS Model.