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From page 4...
... 4 Background As reported by the FHWA, from 2013 to 2015, an average of 18,275 fatalities resulted from roadway departure crashes, which is 54% of all traffic fatalities in the United States for those years (1)
From page 5...
... Introduction 5 Synthesis Objective The highway safety literature is robust concerning the development and evaluation of these countermeasures, but what has not been surveyed and documented is the state of the practice among the state departments of transportation (DOTs) for their use or non-use.

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