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#' The exponential deceleration rate \code{theta} of the lead vehicle.
#'
#' @format \code{theta} is the decelerate from speed \code{upre} to \code{u0} over time \code{t0} to \code{t3}.
#' \describe{
#' \item{theta}{lead vehicle deceleration rate, measured in feet per second.}
#' }
"theta"
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