Expressways are stormwater-intensive land uses, since they are impervious and have highpollutant mass emissions from vehicular activity. Vehicle emissions include pollutants such asheavy metals, oil and grease, particulates from sources such as fuels, brake pad wear, tire wear,and litter(Arnold et at 1996, Driscoll et at 1990). The presence of heavy metals in expresswaystormwater runoff is of concern, as they are very toxic due to enhanced bioavailability, andhave the potential not to degrade in the environment. Therefore, this research was carried outto understand the characteristics of metal pollutants in stormwater runoff from highways inKorea and to treat that runoff using zeolite filtration. The filtration facility was constructed onKorea Highway number 251 (Gaeryong I/C). The facility was operated during storms withdurations of 0.3-4.8 hrs, and the inflow treatment rate was varied from 3.60～17.34 m~3/day.The first flush phenomenon for metal pollutants was observed in all of the storm events. Theaverage removal efficiency was determined to be 62.5 % for TSS, 73.7 % for Cu, 61.8 % forPb, and 67.3 % for Zn.
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