Ramp control to relieve freeway congestion caused by traffic disturbances. Paper presented at the 52nd Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1973.

Seeking ways to improve fixed-time ramp-metering control strategies, a large number of traffic-responsive ramp control plans in terms of freeway service and delay are considered. The analysis yielded a set of plans that yield minimum delay for specified levels of freeway service. These plans are also compared to each other to yield a trade-off curve to assist in final selection of a metering plan.