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