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原文传递 Quantifying The Environmental Effects of Speed Limit Policy-A Case Study From Michigan

题名：	Quantifying The Environmental Effects of Speed Limit Policy-A Case Study From Michigan
正文语种：	eng
作者：	MEGHNA CHAKRABORTY;MD SHAKIR MAHMUD;TIMOTHY J. GATES
作者单位：	Highway Safety Research Center at the University of North Carolina Chapel Hill;Vanasse Hangen Brustlin Inc.(VHB);Michigan State University
摘要：	This case study estimated the change in vehicle operating speeds, fuel consumption, and vehicular tailpipe emissions due to the speed limit increase on selected freeways and non-freeways in Michigan. Due to the new speed limit policy, the vehicular operating speed for passenger and heavy vehicles increased by 2.3 mph and 2.2 mph (3.7 and 3.5 km/hr), respectively, on freeways. On non-freeways, the policy resulted in an increase by 3.4 mph and 3.7 mph (5.5 and 6 km/hr) by passenger and heavy vehicles, respectively. Following the increase in operating speeds, the fuel economy decreased by more than 5 percent and 3 percent for passenger and heavy vehicles, respectively, on freeways. This translated to a substantial annual increase in fuel consumption by 11.9 percent and 11.0 percent for passenger vehicles and heavy vehicles on freeways, respectively. The increase in fuel consumption along non-freeways was 7.2 percent and 25.2 percent for passenger and heavy vehicles, respectively. The increase in fuel consumption resulted in an annual increase of vehicular emissions by the same proportion as fuel consumption for passenger and heavy vehicles on freeways and non-freeways. However, a lack of vehicle-specific data to account for individual vehicle configurations in estimating the emissions was a key limitation to this study and can be explored in future research. Future studies should also consider proportion of alternative engines and electric vehicles in the mix. Also, future research should attempt using more recent emission rates, as currently in this study the emission rates were from 2008 and more recent information was not available, to the best of authors' knowledge.
出版年：	2023
期刊名称：	ITE journal
卷：	93
期：	8
页码：	41-46