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Differential variable speed limits to improve performance and safety of car-truck mixed traffic on freeways

Journal of Traffic and Transportation Engineering(English Edition) 2022年第6期9卷 1003-1016页

作者： anas abdulghani Chris Lee Department of Civil and Environmental Engineering University of WindsorWindsorON N9B 3P4Canada

This study develops a differential variable speed limit(DVSL)which assigns different speed limits for car and truck,and varies speed limits based on traffic *** proposed DVSL algorithm changes speed limits in real time based on truck percentage and occupancy immediately upstream of the ramp and the average speed of the control road sections upstream of the *** algorithm also considers spatial coordination of speeds,which gradually changes the speed limits in successive road sections upstream of the ramp when the severe congestion *** study tested the impacts of DVSL and three other speed limit strategies on delay and safety for a section of the Gardiner Expressway in Toronto,Canada using the VISSIM traffic simulation *** other strategies are 1)uniform speed limit(USL),2)differential speed limit for car and truck(DSL),and 3)USL&DSL(U&D)-i.e.,USL at low truck percentage and DSL at high truck *** was found that DVSL showed the lowest delays for both car and truck among the four *** is mainly because DVSL increased the spacing between vehicles in the right lane upstream of the on-ramp and facilitated vehicles’merging into the mainline *** was also found that DVSL showed the lowest likelihood of rear-end crash between the lead and following vehicles among the four *** study demonstrates that the proposed DVSL algorithm can better control car and truck speeds to reduce delay and improve safety of car-truck mixed traffic flow on freeways.

关键词： Variable speed limit Differential speed limit Truck Traffic performance Safety Freeway

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