Abstract
The roadway pollution dispersion models known as CALINE-3, CALINE-2, AIRPOL-4A, HIWAY, and TRAPS-IIM were compared using the Texas at-grade data and the General Motors data. The Texas data were not used to validate any of the models (except for TRAPS-IIM), thus the comparison to the Texas data represented unbiased tests of the other models. TRAPS-IIM, CALINE-2, CALINE-3, and AIRPOL-4A yielded roughly comparable results for the Texas data. Scatter plots comparing the models to the data showed that all of the models performed poorly in general.
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