DELAYS AND CAPACITIES AT UNSIGNALISED INTERSECTIONS

A THEORETICAL INVESTIGATION IS MADE OF THE OPERATING CHARACTERISTICS OF UNSIGNALIZED INTERSECTIONS. SOME USEFUL APPROXIMATE FORMULAE ARE DEVELOPED FOR AVERAGE DELAY AND CAPACITY IN THE CASE OF TWO CONFLICTING STREAMS OF TRAFFIC. THE THEORETICAL ANALYSIS IS EXTENDED TO THE CASE OF A SIMPLE T-JUNCTION AND A COMPARISONS IS MADE BETWEEN THE PRIORITY RULE (I.E., THE MAJOR ROAD/MINOR ROAD SYSTEM) AND THE YIELD-TO-RIGHT RULE USING AS CRITERIA THROUGHPUT, CAPACITY AND AVERAGE DELAY. IT IS SHOWN THAT THE THROUGHPUT IS GREATER UNDER THE PRIORITY RULE BUT THAT THE YIELD-TO-RIGHT RULE IS SUPERIOR WITH RESPECT TO BOTH CAPACITY AND AVERAGE DELAY. /AUTHOR/