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The significance of the posted minimum speed limits along interstate highways in South Carolina on traffic operation and safety

引用

Journal of Traffic and Transportation Engineering(English Edition) 2021年第5期8卷 715-724页

作者： Saidi Siuhi Md Mahmud Hasan Mamun Judith Mwakalonge Department of Engineering South Carolina State UniversityOrangeburgSC 29117USA Department of Civil Engineering Florida International UniversityMiamiFL 33174USA

This paper evaluated the significance of the posted differential speed limits(DSL)on traffic safety and operation along interstate highways in South *** paper defines DSL as the difference between the posted maximum and minimum speed *** paper used vehicle speed and traffic crashes for *** evaluation results showed over 99%of all vehicles complied with the posted 45 mph minimum speed limit and more than 50%of drivers drove above the posted maximum speed limit regardless of the posted maximum speed *** results also indicated that speed variations increased as the DSL ***,the safety evaluation showed conflicting results on the impacts of the DSL on *** results showed the DSL had negative implications on crashes per AADT per *** is attributed to increased interactions between slower and faster-moving vehicles in the traffic *** the contrary,it was observed that segments with higher DSL had fewer crashes per mile per lane than the segments with the lower *** results suggest there is a need to conduct more research to quantify the efficacy of posting the minimum speed limit because there were no problems observed with motorists driving too slowly on interstate *** results provide important information on the efficacy of posting minimum speed limits to improve the uniformity of traffic flow and safety.

关键词： speed limit minimum speed limit Differential speed limit speed variation Traffic safety Traffic operation

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