Identification of emission hotspots in roundabouts corridors |
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| Institution: | 1. University of Aveiro, Centre for Mechanical Technology and Automation/Department of Mechanical Engineering, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal;2. Institute for Transportation Research and Education, N.C. State University, NCSU, Campus Box 8601, Raleigh, NC 27695-8601, United States;1. Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;3. University of Chinese Academy of Sciences, Beijing 100039, PR China;4. Department of Electrical and Electronic Engineering, Saga University, Saga 840-8502, Japan;1. College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China;2. School of Engineering, Sun Yat-sen University, Guangzhou 510006, China;3. Logistics Research Center, Shanghai Maritime University, Shanghai 200135, China;4. Center for Intelligent Transportation Systems and Unmanned Aerial Systems Applications, State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;5. International Center for Adaptation Planning and Design (iAdapt), School of Landscape Architecture and Planning, College of Design, Construction, and Planning, University of Florida, P.O. Box 115706, Gainesville, FL 32611-5706, USA;1. Jiangsu Key Laboratory of Urban ITS,Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, School of Transportation, Southeast University, Southeast University Road 2#, Nanjing, 211189, PR China;2. School of Automobile, Chang’an University, Chang’an Road, Xi’an 710064, Shaanxi, PR China;1. Civil and Environmental Engineering Department, University of Tennessee, Knoxville, TN 37996, USA;2. Civil and Environmental Engineering, Department University of Maryland, College Park, MD 20742, USA;3. Jeju Development Institute, 53 Ayeon-ro, Jeju City 690-162, South Korea |
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| Abstract: | This study describes a methodology to quantify and characterize the vehicular emissions of functionally interdependent roundabouts at a corridor level. Corridor segments include those upstream of each roundabout, the circulating area, downstream of the roundabout as well as midblock sub-segments between adjacent roundabouts. The main purpose of the study is to identify the locations along the corridors where emissions tend to be consistently high. These locations are termed “Emission Hotspots”. The methodology is applied to four existing roundabout corridors in San Diego (California) and Avon (Colorado) in the United States, and in Mealhada and Chaves (Portugal). An extensive sample of second-by-second speed traces is available for these four corridors with roundabouts.The analysis shows that when roundabouts are fairly spaced and have similar geometric design features, no significant differences are observed between emissions of roundabouts located in the corridor. In such cases, the downstream sub-segments are the emission hotspots both in absolute terms (overall contribution on total emissions is higher than 34%) and per unit distance (22% higher than the average corridor value). When roundabouts are unequally spaced the highest emissions hotspots (more than 9% above the average corridor value) are found at the circulating area sub-segments. The results also demonstrate that the entry deflection angle has a slight impact on the spatial distribution of emissions especially in the case of closely spaced roundabouts. |
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| Keywords: | Roundabout corridor Emissions Vehicle Specific Power Microscale analysis |
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