This paper discusses the Sheepscar scheme which is a major intersection consisting of a system of signals close to the centre of the city of Leeds in west Yorkshire. The paper firstly discusses the scheme in the context of the specific problems of congestion in the Sheepscar area, and shows how the various signaled junctions contained in the scheme are used to solve these problems. The paper then examines in a more general sense the underlying principles on which the Sheepscar signaled-system is based. It discusses how the principle of conflict-separation can be complemented by precise control to achieve a signal scheme of particularly good performance, and it stresses that this is dependant on signal engineers being able to influence the basic road layout. The paper also compares the 'Sheepscar' type signaled-system with two alternative forms of intersection, these being 'grade-separation' and 'signal-controlled roundabouts'.(a) for the covering abstract of the seminar see IRRD 273510.
Samenvatting