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PDF (DX094490.pdf) - White Rose Etheses Online

PDF (DX094490.pdf) - White Rose Etheses Online

216 operation below and

216 operation below and around capacity. 5. Delay increases only slowly with the circulating flow as long as the entry is not operating at or near capacity. 6. The turning proportions of the entering flow were introduced into the simulation model and the effect on entry flow and delay was studied. In below-capacity operation the turning proportion is not affecting the entering flow for both flared and straight entries. At above-capacity operation, turning proportion does not affect the capacity of straight entries but it does affect the capacity of flared entries. Highest capacity is obtained for the maximum left-turning proportion and lowest for zero left-turn proportion; the difference being of the range 25 - 30%. Turning proportions affect delays for both flared and straigfi 1 entries. Minimum delay was obtained for combinations which include a left- turning proportion of 30 - 40% and maximum delay for zero left-turn. 7. This work could not conclude in the production of a ntathernatical relation between the parameters studied. Further it did not study the effects of the proportion of heavy goods vehicles in the flows or of gradient on roundabout performance. Such study would entail the collection of more data and has to be left for further work in this area. Finally, it must be noted that despite the advantages computer simulation has (mentioned in Chapter 5), its major disadvantage is that one is never certain that such a model is consistently behaving as it

217 hou1d. Therefore any change in input parameters outside the tested range can make evident shortcomings of the model.

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