00743728

Component

https://doi.org/10.3141/1587-15

http://scholar.google.com...Datz&publication_year=1997

The theoretical development of the queueing model used in the FLINT (FLorida INTersection) air quality model is described. FLINT is an area source model used to predict carbon monoxide concentrations for undersaturated and oversaturated traffic conditions at signalized intersections. In the FLINT model, deterministic queueing is used to estimate the queue length for cases of undersaturated conditions. In oversaturated cases, a cycle failure method has been developed to estimate queue length. In addition, a new concept is presented for calculating idling time for each vehicle's position in the queue during both the red and the green phases of the traffic signal cycle. A limited set of undersaturated cases from monitoring data in Melrose Park, Illinois, was used to compare the predicted queue lengths with the measured queue lengths for several air quality models. It was found that FLINT predicted the queue length within one vehicle of the observed queue length. The same cases were tested using CAL3QHC, TEXIN2 intersection air quality models, and the American Automobile Manufacturers Association (AAMA) simulation model. It was found that predictions of the AAMA and the FLINT models were very close to the measured queue lengths in cases of undersaturated conditions. Moreover, although the FLINT and the AAMA models use a different approach to estimate queue length, the AAMA models sue a different approach to estimate queue length, their predicted queue lengths were very close in oversaturated cases. However, the predicted queue lengths of CAL3QHC were too long for oversaturated cases.

This paper appears in Transportation Research Record No. 1587, Effects of Transportation on Energy and Air Quality.

English

p. 128-136

1997

Transportation Research Record

0309061695

Figures (9) ; References (14)

Accuracy; Air quality; Algorithms; Alternatives analysis; Carbon monoxide; Engine idling; Forecasting; Mathematical models; Queuing; Signalized intersections; Time; Traffic congestion; Traffic oversaturation

Air quality models

Environment; Highways; Vehicles and Equipment

TRIS, TRB

Dec 29 1997 12:00AM

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• EMISSIONS IMPACT OF ELIMINATING NATIONAL SPEED LIMITS: ONE YEAR LATER
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• MODELING FRAMEWORK FOR ESTIMATING EMISSIONS IN LARGE URBAN AREAS
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