Abstract
Transportation fleets and on-road driving characteristics have known as significant factors on traffic emissions, additionally important parameters in International Vehicle Emission (IVE) model for emission inventories. Using data collected in Ho Chi Minh City, this paper analyzes characteristics of these parameters and it mainly focuses on passenger car (PC) and motorcycle (MC). It is revealed that the fleets are characterized by young PCs and MCs with medium engine volume and low usage. The video analysis shows that the on-road traffic is composed of 89% MCs, 6% PCs and 5% for other modes. Vehicle specific power (VSP) and engine stress were adopted for driving condition analysis. The VSP of positive power and engine stress at medium/high levels, indicating stable driving conditions are commonly found on highway but not on arterial and residential streets. It is found that the start-up with long engine soak usually happens during peak hours (6:00~8:00 and 16:00~18:00).
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