![]() ![]() Traffic engineers and transportation planners can utilize the results of this study in three ways: the predictive models can be applied to calculate the expected source of emissions, fuel consumption, and traffic performance parameters for any intersection situation that was included in the range of simulated conditions these values can be looked up in a series of tables and the TEXAS-II computer simulation program can be run to obtain detailed data concerning any specific intersection environment of practical interest. The factors which were used for simulating the intersection environment were (1) intersection size, (2) presence or absence of a special left-turn lane, (3) more » pretimed signal control, (4) fully-actuated signal control, (5) all-way stop-sign control, (6) traffic volume, (7) number of left turns, and (8) number of heavy-duty vehicles. For this study, a computer simulation model called TEXAS-II was developed at the Center for Transportation Research to estimate with respect to time and location the source of carbon monoxide, hydrocarbon, and oxides of nitrogen emissions and the amount of fuel consumed by vehicles as they pass through an intersection. High concentrations of vehicular emissions at road intersections are a health-related issue of concern, and the associated fuel consumption is a matter of continuing economic interest. Second, a series of tables can be used for convenient look-up of these values, or finally, the TEXAS-II computer simulation program can be executed to obtain detailed data concerning a specific intersection environment of practical interest. First, the predictive models can be applied to calculate the expected emissions, fuel consumption, and traffic performance parameters for any intersection situations that was included in the range of simulated conditions. ![]() Traffic engineers and transportation planners more » can utilize the results of this study in one of three ways. The factors which were used for simulating the intersection environment, were 1) intersection size, 2) presence or absence of a special left-turn lane, 3) pretimed signal control, 4) full-actuated signal control, 5) all-way stop-sign control, 6) traffic volume, 7) left turns, and 8) heavy-duty vehicles. The resulting data were utilized to build predictive models for emissions and fuel consumption at intersections. ![]() The TEXAS-II simulation model was run approximately 300 times in a series of designed experiments to obtain quantitative estimates of the effects of various traffic and intersection factors on emissions, fuel consumption, traffic delays, and queue lengths. For use in this study, a computer simulation model called TEXAS-II was developed by the author and others to estimate with respect to time and location the emissions of carbon monoxide, hydrocarbons, and oxides of nitrogen as well as the amount of fuel consumed by individually-characterized vehicles as they pass through an intersection environment which can be described accurately in terms of its geometric features, traffic control, and traffic stream characteristics. ![]()
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