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#' Space headway \code{h3} at time \code{t3}, the time the lead vehicle has decelerated to breakdown speed \code{u0}.
#'
#' @format \code{h3} is the headway \code{hsafe(u3)} where \code{u3} = \code{u0}, the lead vehicle speed at \code{t} = \code{t3}.
#' \describe{
#' \item{h3}{headway between lead and following vehicles, measured in feet.}
#' }
"h3"
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