Detecting stoppage waves for freeway control. Paper presented at the 52nd Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1973.

The need to alert drivers approaching crest vertical curves of traffic stoppages ahead led to study automatic means of detecting stoppages waves. After analyzing selected speed and energy parameters, it is concluded that both were satisfactory indicators of stoppage waves. A computer algorithm was then structured for automatic control of the warning system.