This study was conducted to analyze the amount of carbon dioxide generated by major types of traffic safety facility works during road construction, including traffic safety signs, median dividers, roadside guardrails, and gaze guidance facilities.The material and fuel input units for each detailed construction type were set based on the design data for road construction and top-level data, and the quantities were input and analyzed based on the design data. For the top-level data, civil engineering and design data provided by the Public Procurement Service were organized based on the general national road data and analyzed using SimaPro, a commercial program. A total of 300 [SI units] were generated for a 4.4 km section of the four-way road. Traffic safety signs were roughly 2.3 , guardrails were about 287.2 , and gaze guidance facilities were approximately 10.2 . Although the extension or quantity of each facility will vary depending on the characteristics of the design section, if the construction section is based on the basic unit, it can be determined that about 68.1 [SI units] of total carbon dioxide were generated, of which about 0.5 was generated for traffic safety signs, about 65 for guardrails, and about 2.3 was generated for gaze guidance facilities. In this study, we analyzed environmental factors that impact the construction of traffic safety facilities that were not specifically calculated in Korea. Moreover, our results can be used to judge the amount of carbon generated by road cycles in the future or to evaluate the qualities of carbon in terms of various types of traffic safety facilities.

PURPOSES : In this study, emissions from asphalt mixture production and construction processes are calculated and used to estimate the emission from each asphalt pavement layer. The calculated emissions for the processes are used as fundamental data to estimate the total emission from the entire life cycle of pavement engineering in South Korea. METHODS : A design proposal and the Korean standard, which provide quantitative information for activities, were used to estimate the amount of construction materials and energy consumption. Subsequently, the LCI DB from NAPA and the LCIA DB from EPA were utilized in conjunction with the estimated quantity to assess the effect of the emissions to determine their environmental impact categories. RESULTS : Calculation results show that 5.84 million ton of CO2eq is discharged from production and construction processes, whereas 3.24 million ton of CO2eq is discharged from operation processes in the pavement engineering sector. The total GHG emission, i.e., 9.08 million ton of CO2eq, is approximately 1.25% of the national GHG emission in 2018. The asphalt mixture production process results in the highest GHG emission in the life cycle of asphalt pavements. CONCLUSIONS : An LCI DB that accounts for the industrial characteristics of South Korea must be established to provide more reliable emission data to be used for national GHG reduction plans, including those for the pavement engineering sector.