A significant body of research has documented disparities in TRAP exposure across racial, ethnic, and income groups in the U.S., consistently finding that people of color and lowerincome populations are disproportionately exposed to higher levels of air pollution. Studies have shown that Black, Hispanic, and Asian communities experience both higher levels of trafficrelated pollution and worse health outcomes , such as respiratory and cardiovascular diseases, when compared to White populations. A recent review by , which examined 55 studies on air pollution exposure by ethnic groups in high-income countries, reported that U.S. minority ethnic groups are more exposed to air pollutants like PM2.5 and NO2 than the majoritized ethnic group (i.e., White) . However, despite the clear evidence of exposure disparities, few national-scale studies have quantified the contributions of different vehicle types-such as light-duty vehicles (LDVs), medium-duty vehicles (MDVs), and heavy-duty vehicles (HDVs)-to exposure and equity separately . Furthermore, these studies often focus on a single pollutant, typically PM2.5, and rely on spatially coarse resolution data, such as county level aggregates from the EPA National Emissions Inventory (NEI). While useful for identifying broad trends, this resolution can obscure localized exposure patterns, especially near transportation corridors. Additionally, many studies lack the statistical analysis needed to assess exposure disparities across racial, ethnic, and socioeconomic groups.