Abstract
The higher contribution of traffic delay to environmental impacts is urging the highway agencies to take work zone management into the maintenance schemes decision-making. Aiming to understand the role of work zone management in user CO2 emissions reduction, this paper firstly developed a practical methodological framework of traffic delay-related CO2 emissions caused by highway maintenance based on a popular life cycle user cost analysis approach in regard of the microscopic vehicle operation analysis. The method was applied in an actual freeway flexible pavement with 15-year design life in Shaanxi Province, China, covering three types of preventive maintenance, correction maintenance, and rehabilitation. In addition, the impacts of key inputs of proposed method on work zone user CO2 emissions results were checked. The results show that traffic delay attributes to 29.4% of total CO2 emissions of the life cycle of highway pavement maintenance, and 51.8% of work zone user CO2 emissions result from preventive maintenance, especially from micro vehicle operations including speed change and queue near work zone (62% of total work zone user CO2 emissions). The work zone management alternative strategies related to less traffic volume or higher highway capacity including vehicle type limitation and the limited work zone speed have an advantage in reducing the work zone CO2 emissions over changing work zone length or work zone timing. The findings in this paper may present a useful tool and reference for robustly supporting the decision-making on highway maintenance carbon mitigation in work zone traffic.
Highlights
Academic Editor: Maria Angeles Garcıa e higher contribution of traffic delay to environmental impacts is urging the highway agencies to take work zone management into the maintenance schemes decision-making
Aiming to understand the role of work zone management in user CO2 emissions reduction, this paper firstly developed a practical methodological framework of traffic delay-related CO2 emissions caused by highway maintenance based on a popular life cycle user cost analysis approach in regard of the microscopic vehicle operation analysis. e method was applied in an actual freeway flexible pavement with 15-year design life in Shaanxi Province, China, covering three types of preventive maintenance, correction maintenance, and rehabilitation
The existence of the work zone will affect the operation of passing vehicles and generate additional carbon emissions. e findings in previous studies indicate that construction-related traffic delay was even the greatest contributor to environmental impacts throughout the whole highway pavement life cycle [12, 13]
Summary
Academic Editor: Maria Angeles Garcıa e higher contribution of traffic delay to environmental impacts is urging the highway agencies to take work zone management into the maintenance schemes decision-making. E results show that traffic delay attributes to 29.4% of total CO2 emissions of the life cycle of highway pavement maintenance, and 51.8% of work zone user CO2 emissions result from preventive maintenance, especially from micro vehicle operations including speed change and queue near work zone (62% of total work zone user CO2 emissions). E findings in previous studies indicate that construction-related traffic delay was even the greatest contributor to environmental impacts throughout the whole highway pavement life cycle [12, 13]. Most of these few studies on traffic delay CO2 emissions Lizasoain-Arteaga et al [21] evaluated the performance of macrosimulation method and microsimulation method for estimation of work zone traffic delay-related 6 pollutants (CO2, CO, NOX, CH4, C6H6, NH3, VOC, and PM2.5). e findings show that macrosimulation could be used for rough calculations, but it should be noted that there is a significant deviation of the emissions results when the highway presents “A” level of service and “C” level of service
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