Instrumentation development and contribution from traffic flow theory. Paper presented at the 50th Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1971.

The contribution of flow theory to traffic control is reviewed from a historical standpoint, and developments in traffic surveillance are surveyed. With respect to the latter, it is noted that the increasing costs of police operations, and the increasingly varying demands placed on police, will eventually require a complete shift to digital surveillance and control.