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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 were collected by loop detectors, and the time units are 30 seconds per observation (see Petty et al., 1996, for details).

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Two data frames (`lane2`

and `lane3`

) each with 1318
observations on the following two variables:

- flow
a numeric vector giving the traffic flow in vehicles per lane per hour.

- speed
a numeric vector giving the speed in miles per hour.

The data is examined in Einbeck and Tutz (2006), using a nonparametric approach to multi-valued regression based on conditional mean shift.

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”.
*Transportation Research Part C: Emerging Technologies*, **4**,
71-85.

The data is provided by courtesy of CALIFORNIA PATH, Institute of Transportation Studies, University of California, Berkeley.

Einbeck, J., and Tutz, G. (2006). “Modelling beyond regression
functions: an application of multimodal regression to speed-flow data”.
*Journal of the Royal Statistical Society, Series C (Applied
Statistics)*, **55**, 461-475.

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