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Variable advisory speed limit systems reduce variability in speeds and improve safety at congested work zones.

FINDINGSUrban Case StudiesAt uncongested sites on I-270, the average speeds with VASL were lower by 2.2 mi/hr, than without VASL. The standard deviation of speeds with VASL was higher, by 4.4 mi/hr,…
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Date Posted
04/29/2014