Comparative study on the capacity of a signalised roundabout PROJECT TITLE :Comparative study on the capacity of a signalised roundaboutABSTRACT:Traffic signal control at roundabouts is proved to be effective in addressing significant traffic. However, the applicability of a signalised roundabout, especially compared with a signalised intersection, in terms of capability has not been investigated. For signalised roundabouts, unsignalised roundabout capability models as well as gap-acceptance theories and regression models don't seem to be applicable. This study first introduces a shockwave-based model to capture the impacts of signals at circulatory lanes on queuing and clearance time of left-turning vehicles. On this basis, a general signal timing model and a capacity model are developed. A sensitivity analysis is then elaborated to test how temporal and spatial parameters affect the capability of a signalised roundabout. Capability comparisons are created among signalised roundabouts, unsignalised roundabouts and signalised intersections. The results show that (i) underneath high traffic demand, a signalised roundabout outperforms an unsignalised roundabout; (ii) a signalised roundabout achieve higher capability than a signalised intersection will beneath bound condition, (iii) however a signalised intersection outperforms a signalised roundabout when optimal cycle length is relatively short (65 seconds during this study), (iv) capability of a signalised roundabout is terribly sensitive to the variation of signal parameters, hence care ought to be taken to design the parameters to confirm high capability. Did you like this research project? To get this research project Guidelines, Training and Code... Click Here facebook twitter google+ linkedin stumble pinterest First SF6 Breaker Design: Westinghouse Engineers Tell the Inside Story [History] Comment on “A Unified State-Space Model of Constant-Frequency Current-Mode Controlled Power Converters in Continuous Conduction Mode”