Modelling of traffic operations in urban networks in developing countries

Hossain, Moazzem (1996) Modelling of traffic operations in urban networks in developing countries. University of Southampton, Doctoral Thesis.

Abstract

Considering the relatively smaller data requirement and easy adaptability to different situations, compared to purely empirical approaches, it was decided to develop a micro-simulation model which would be able to simulate the traffic operations at typical urban network/corridor of developing countries. In order to be able to replicate the non-lane based flow characteristics of developing countries traffic, a co-ordinate approach to modelling vehicle location was adopted.

An extensive video and manual data collection exercise was made in Dhaka, Bangladesh for the purpose of calibration and validation of the model. After modifying the model based on field experience and calibrating the model parameters, it was validated on two road corridors of Dhaka city which were quite different in character. The validation process indicated that the modelling approach and the logic were working as intended.

The model was applied to various roadway and traffic conditions to test a range of alternative traffic scenarios. The model has come out with some encouraging results which will certainly enhance the understanding of traffic operations at developing countries roadway intersections as well as networks. In general, it was found that the capacity of road intersections and particularly signalised intersections and roundabouts, increases when non-motorised vehicles are banned from the traffic stream. By banning the non-motorised vehicles, a 30% reduction in the corridor travel time of motorised vehicles could be achieved. The same measure could also result in an increase in the corridor passenger movement capacity by more than 300% without increase in travel time. For higher demand flow, lower road width and higher proportion of non-motorised vehicles, the larger size vehicles experience the higher delay. In all the cases, the model was the tool to achieve the results. (DX192693)

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