User's Guide to the TEXIN2/MOBILE4 Model - A Model for Predicting Carbon Monoxide Concentrations Near Intersections

The original TEXIN model, which was previously developed to predict carbon monoxide concentrations near simple intersections, had several restrictions that inhibited its use in many realistic cases. The model was expanded to include modeling capabilities of four-way stop intersections. The CMA Operations and Design Procedure traffic algorithm was added to allow for more accurate representation of T-intersections. The addition of the EPA emissions model, MOBILE3, enables the user to more accurately estimate source strength. The new calculational methodologies and algorithms present in MOBILE3, including vehicle anti-tampering and inspection/maintenance programs, greatly enhance the capabilities of the model. The TEXIN2 model employs a short-cut emissions algorithm for users who do not wish to use MOBILE3. This report is intended to assist the analyst in the execution of the TEXIN2 model. A brief description of the model is first given. Next, the input data required by the model are presented. Finally, several illustrative examples are presented. These examples should be able to answer most questions concerning the use of the program. The user that requires additional information on the TEXlN2 model should consult TTI Research Report 283-3F.