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Signal Phase and Timing (SPAT) with an Intersection Collision Model (101-FH3) Small Business Innovation Research (SBIR) Phase II

Project Information

Project ID: 
Project Status: 
Start Date: 
Friday, May 20, 2011
End Date: 
Tuesday, May 19, 2015
FHWA Program: 
Small Business Innovation Research, Operations
FHWA Subprogram: 
Transportation Systems Management and Operations
TRT Terms: 
Traffic Signal Phases; Operations; Research; Collisions; Intersections; Dilemma Zone; Highway Traffic Control; Traffic Signal Timing
FHWA Discipline: 
Operations, Safety
Subject Area: 
Operations and Traffic Management, Research, Safety and Human Factors

Contact Information

First Name: 
(202) 493-3045
Email Address: 
Transportation Enabling Technologies Team
Office of Operations Research and Development
Office Code: 

Project Details

Project Description: 

Harmonia has developed an index of Traffic EXperimental Analytical Simulation (TEXAS) documentation, documented global variables and subroutines in Simulated Processing (SIMPRO), and added newly developed subroutines into the TEXAS documentation database. Harmonia has developed the Enhanced Traffic EXperimental Analytical Simulation (eTEXAS), a Java Application Programming Interface for the TEXAS Model. We have set up SIMPRO for compilation using free and open source software and modified the TEXAS source code to accomplish the central step of reorganizing TEXAS as a simulation library for programmatic invocation by the Connected Vehicle program or other applications. We have also implemented Java interfaces to the simulation for portability for the Society of Automotive Engineers (SAE) J2735 messages, Variable Message Signs messages, Signal Controller Messaging System (SCMS) messages, and obtaining vehicle updates. In addition, we have developed a graphical user interface for Delta Time (DT) simulation and a simplified Java version of Bonneson's dilemma zone Control Systems (D-CS) algorithm for validation of eTEXAS. Harmonia has also created a project Web site to host the free and open source eTEXAS project, which includes source code, documentation materials, and developer community facilities.


The key project objective is to determine whether signal phase and timing (SPAT) can be simulated with an intersection collision model and, if possible, whether this simulation can be converted into a tool useful for developing analyses of SPAT.

Partners and Other Sponsor/Managing/Performing Organizations: 
Project Output: 

The tentative answer is that signal phase and timing (SPAT) can be simulated with an intersection collision model, and that the combined model might be useful for safety and operations research.