#' The following \code{l} vehicle speed \code{ul3} at time \code{t3}.
#'
#' @format The lead vehicle speed at \code{t2} is estimated with the exponential speed function \code{gbm(upre, theta, t3)}.
#' \describe{
#' \item{ul3}{speed, measured in feet per second.}
#' }
"ul3"
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