Evaluation of TexSIM for modeling traffic behavior at diamond interchanges
Date
1995
Journal Title
Journal ISSN
Volume Title
Publisher
Texas A&M University
Abstract
Poor operation of diamond interchanges along a freeway corridor can decrease the mobility of the corridor and increase time and energy costs associated with delay at signalized interchanges. Computer simulation provides a safe and efficient means of evaluating existing timing plans for diamond interchanges and testing new timing plans before they are implemented in the field. This research evaluates the effectiveness of using the Texas Transportation Institute's computer model, TexSIM 2.0, for simulating traffic behavior at signalized diamond interchanges. To evaluate TexSIM 2.0 for simulating and providing accurate descriptive measures of performance for pretimed and actuated diamond interchanges, model outputs were compared to field data collected from diamond interchanges in College Station, Austin, and Round Rock, Texas. The results suggest that the model can replicate field conditions with good accuracy for the exterior approaches of the pretimed diamond interchanges; however, Queue lengths and stopped delay were consistently overestimated for the interior left turns. Phase and cycle lengths for the actuated diamond interchange were much shorter than observed in the field due to phases not being held on long enough in the simulator. The short phase lengths were caused by a difference in effective detector length between the field and the model. The problems caused by the difference in detector lengths caused the MOE data collected from the simulator to be inaccurate. Recommendations were made for possible solutions to correct the differences between field data and model data found in this research.
Description
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Includes bibliographical references.
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references.
Issued also on microfiche from Lange Micrographics.
Keywords
civil engineering., Major civil engineering.