Carbon emissions, produced by automobile fuel consumption, are termed as the key reason\nleading to global warming. The highway circular curve constitutes a major factor impacting vehicle\ncarbon emissions. It is deemed quite essential to investigate the association existing between circular\ncurve and carbon emissions. On the basis of the IPCC carbon emission conversion methodology, the\ncurrent research work put forward a carbon emission conversion methodology suitable for Chinaâ??s\ndiesel status. There are 99 groupsâ?? test data of diesel trucks during the trip, which were attained on\n23 circular curves in northwestern China. The test road type was key arterial roads having a design\nspeed greater than or equal to 60 km/h, besides having no roundabouts and crossings. Carbon\nemission data were generated with the use of carbon emission conversion methodologies and fuel\nconsumption data from field tests. As the results suggested, carbon emissions decline with the\nincrease in the radius of circular curve. A carbon emission quantitative model was established with\nthe radius and length of circular curve, coupled with the initial velocity as the key impacting factors.\nIn comparison with carbon emissions under circular curve section and flat section scenarios, the\nminimum curve radius impacting carbon emissions is 500 m. This research work provided herein a\ntool for the quantification of carbon emissions and a reference for a low-carbon highway design.
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