Effects of the 80 km/h and variable speed limits on air pollution in the metropolitan area of barcelona |
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| Institution: | 1. Univ. Lyon, ENTPE, IFSTTAR, LICIT, F-69518 Vaulx-En-Velin, France;2. IFSTTAR, AME, LAE, F-44344 Bouguenais, France;1. Jiangsu Key Laboratory of Urban ITS, Southeast University, 2 Si Pai Lou, Nanjing 210096, China;2. Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, 2 Si Pai Lou, Nanjing 210096, China;1. School of Transportation Engineering, Tongji University, 4800 Cao’an Road, 201804 Shanghai, China;2. Department of Civil, Environmental and Construction Engineering, University of Central Florida, Orlando, FL 32816-2450, United States;1. School of Transportation, Southeast University, Nanjing, China;2. Jiangsu Key Laboratory of Urban ITS, Jiangsu Province, China;3. Department of Transport and Planning, Delft University of Technology, the Netherlands |
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| Abstract: | In 2008 the regional government of Catalonia (Spain) reduced the maximum speed limit on several stretches of congested urban motorway in the Barcelona metropolitan area to 80 km/h, while in 2009 it introduced a variable speed system on other stretches of its metropolitan motorways. We use the differences-in-differences method, which enables a policy impact to be measured under specific conditions, to assess the impact of these policies on emissions of NOx and PM10. Empirical estimation indicate that reducing the speed limit to 80 km/h causes a 1.7–3.2% increase in NOx and 5.3–5.9% in PM10. By contrast, the variable speed policy reduced NOx and PM10 pollution by 7.7–17.1% and 14.5–17.3%. As such, a variable speed policy appears to be a more effective environmental policy than reducing the speed limit to a maximum of 80 km/h. |
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| Keywords: | Urban air pollution Traffic speed management Speed controls |
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