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There are several differences between freeways and general national roads in terms of structures, conditions and limited speeds. Likewise, the characteristics of emission in these roads differ depending on the road types. For these reasons, it is necessary to compare the two types of roads in terms of emissions. The study was performed targeting Gyeongbu Expressway and National Highway 1. Firstly, the amount of emission each car was compared in the whole sections of the both. Secondly, top 10 sections were picked out, and then emission each section were compared. Lastly, two sections which were with the highest and lowest amount of emission per car, were compared. As results, it were found that there were less amount of emission on freeways. because cars are running on uniform velocity at relatively high speed, and that there were more amount of emission on the national highway. because of frequent intersections and associated congestion. It may be concluded that the amount of emission at the national highway could be reduced if signal coordination and intersection intervals are improved there.

Comparison of Vehicle Carbon Emissions in Expressway and National Highway