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Title: An investigation into rotary highway intersection performance through computer simulation : a digital computer simulation technique is used to investigate the operational efficiency, based on delay and capacity, of a mini-roundabout in comparison with a conventional rotary highway intersection.
Author: Al-Salman, Hazim Shakir Taha
ISNI:       0000 0001 3408 5039
Awarding Body: University of Bradford
Current Institution: University of Bradford
Date of Award: 1976
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The digital electronic computer is successfully used to simulate many events encountered in the flow of vehicular traffic, especially the complex traffic phenomena at highway intersections. This investigation exclusively deals with the development of two models to investigate the traffic performance at a mini-roundabout and a conventional rotary intersection. The method of approach is by using simulation techniques on a digital ICL 1900 electronic computer. The study includes many variables such as queue length. Gap acceptance and vehicle movements in the rotary. The two types of intersection under study are classified according to the number of approaches. Those approaches are either 3, 4 or 5. The number of lanes in each of these approaches can have a value of either 1, 2, 3 or 4 depending on the actual flow and the space available. The criteria includes the possible existence of such type of intersection. The input data includes number of approaches, number of lanes in each approach, length of rotary intersection, speed distribution, gap acceptance distribution, approach volumes and turning manoeuvres. The output from the simulation models presented a considerable number of simulated delays to vehicles on the approach lanes and of the intersections as a whole. A series of computer runs were undertaken and the results were analysed to study the effects of some intersection and traffic parameters on the average and total delays. Validation study was carried out on two sites in the West Yorkshire area using time lapse cine photography and the observed results were analysed and compared with the simulated ones. For the approach lanes in the rotary section six forms of delay formulae are introduced. These formulae represent the relationship between the approach lane traffic flow and the traffic volume in the rotary section and the average delay in the approach lane..
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available