\name{lane}\alias{lane2}\alias{lane3}\title{Speed-Flow data for Californian Freeway}\description{These are two data sets collected in 1993 on two individual lanes(lane 2 and lane 3) of the 4-lane Californian freeway I-880. The data werecollected by loop detectors, and the time units are 30 seconds perobservation (see Petty et al., 1996, for details).}\usage{data(lane2)data(lane3)}\format{ Two data frames (\code{lane2} and \code{lane3}) each with 1318  observations on the following two variables:  \describe{    \item{\code{flow}}{a numeric vector giving the traffic flow in vehicles per lane per hour.}    \item{\code{speed}}{a numeric vector giving the speed in miles per hour.}}}\details{The data is  examined in Einbeck and Tutz (2006), using a nonparametric approachto multi-valued regression based on conditional mean shift.}\source{Petty, K.F.,  Noeimi, H., Sanwal, K.,  Rydzewski, D., Skabardonis, A.,Varaiya, P., and  Al-Deek, H.  (1996). ``The Freeway Service Patrol Evaluation Project:Database Support Programs, and Accessibility''. \emph{Transportation Research Part C: EmergingTechnologies}, \bold{4}, 71-85.The data is provided by courtesy of CALIFORNIA PATH, Institute of Transportation Studies,University of California, Berkeley.}\references{Einbeck, J., and Tutz, G. (2006). ``Modelling beyond regression functions: an application of multimodal regression to speed-flow data''. \emph{Journal of the Royal Statistical Society, Series C (Applied Statistics)}, \bold{55}, 461-475.}\keyword{datasets}\examples{ plot(lane2$flow, lane2$speed)}