Practices for Preventing Roadway Departures (2018) / Chapter Skim
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1 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 (1)
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2 Practices for Preventing Roadway Departures • An online questionnaire sent to all 50 state DOTs and that of Washington, D.C., for the purpose of determining the countermeasures being used by those agencies and related issues; and • Interviews with representatives in three states to develop case examples for specific successful countermeasures and roadway departure programs. The initial literature search identified 20 countermeasures, which in turn were used as the focus of a questionnaire survey of the states' practices.
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Summary 3 • Increasing the clear zone, • Flattening side slopes, and • Increasing sight distance for curves. The use of the first four countermeasures has become so widely accepted as effective that some states are now integrating them into their design guidelines with criteria as to where they should be deployed.
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