Characteristics of freeway traffic and of freeway lane-changing behavior. Paper presented at the 52nd Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1973.

Using extensive data available from aerial photographs of traffic, detailed traffic characteristics such as time headway distribution, time speed distribution, space headway distribution, and space speed distribution are presented. Data are given for every lane and for various levels of traffic service, in both graphical and summary table forms.