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Abstract
A human factors study consisting of a vehicle headway analysis and a questionnaire survey was
conducted in Rhode Island (RI) to investigate tailgating issues and possible means for tailgating
treatment. Vehicle headways were collected from highway surveillance videos and serious tailgating
issues were identified on RI highways. The results of the questionnaire survey further confirmed
the observations made in the vehicle headway analysis that most RI drivers maintained insufficient
vehicle headways on highways. Among a few tailgating treatments presented in the survey, most
subjects preferred a system consisting of equally spaced, white horizontal bars marked on pavement
and overhead graphic-aided dynamic message signs.