Abstract
Road sediment is collected by road sweepers, however, it will be flushed because of rainfall. We investigated to determine the collected amount of road sediment and the harm substances attached on the sediment originated from mobile exhaust gases. The correlation analysis was conducted between the environmental factors, such as traffic numbers, species, amount of precipitation and sunny period.TOC attached on the sediment has the positive correlation with the total traffic numbers, especially Large Freight Vehicles and Large-sized Special Motor Vehicles. On the other hands, the amount of precipitation has the negative correlation with TOC. It will be assumed that the organic carbon originated from exhaust gas can be washed by rainfall and move to road run-off. Some of poly aromatic hydrocarbons are found to have same correlation with environmental factors. Ferric compound has the relation with traffic number because the metal will come from car bodies. Zinc and cadmium have also correlation with the numbers.
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