Nothing
#' The following \code{f} vehicle speed \code{uf1} at time \code{t1}.
#'
#' @format The following vehicle speed at \code{t1} is assumed to be dependent on the lead vehicle speed \code{ul1}.
#' \describe{
#' \item{uf1}{speed, measured in feet per second.}
#' }
"uf1"
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