Abstract
This paper describes simulation experiments which relate to single-direction flow between signalised intersections in which the flow follows the diffusion theory of Pacey. The paper describes an extension of the Dunne-Potts control policy which deals well with such flow and shows that, provided care is taken in the selection of red-time for the preferred direction, mean queue length and mean delay may be optimised. Under these circumstances signal switching "pulls-into-step" automatically, with offset approximately equal to mean transient-time between intersections.