Abstract
The current value of capacity of basic freeway segments has beencalled into question with increasing numbers of observations of flow rates in excess of 2, 000 passenger cars per hour per lane. The results of studies at seven high-volume sites in texas are discussed. In addition, data are presented with variations in flow rates by lane. Finally, data are presented illustrating differences in flow ratesbefore and after the onset of upstream congestion. This paper appears in transportation research record no. 1320, Freeway operations, highway capacity, and traffic flow 1991.