To provide a traffic efficiency solution for a road network including a roundabout intersection and a signalised intersection

  • Nitin Dhir

    Student thesis: Other thesis - CDU

    Abstract

    In a modern society, transportation networks support complex economic and social interactions, making them a major component of our society. Traffic congestion still remains a major concern in the field of traffic engineering due to an increasing population. Traffic congestion can be referred as a state in which the traffic flow at a road network is experiencing high densities and low speeds, consequently leading to negative impacts on society.

    A city of Darwin, NT, Australia, is considered as one of the least populated cities. While Darwin maintains overall satisfactory traffic conditions, newly constructed suburbs and recent increase in migration has led to a drastic increase of transportation footprint. As a result, several road networks experience congestion during peak hours (AM and PM). A road network including two intersections; roundabout and signalised intersection currently experience this issue. This paper aims to provide a traffic efficiency solution for this network.

    Traffic surveys such as traffic volume, queue length surveys were conducted to develop a road network in SIDRA INTERSECTION 8 with numerous site visits. This software is a micro-analytic modelling tool that will be used for simulating the results from traffic surveys. The results suggest that during both AM and PM peak traffic, the two most affected approaches include; exit north Nightcliff road and Progress drive, where the Degree of Saturation (DoS) was discovered to be more than the maximum practical DoS and unsatisfactory Level of Service (LoS).

    Diverse intersections were explored in providing a solution to traffic congestion on Progress drive. An addition of a shared lane on Progress drive ensuring both lanes are allowed to turn right is one of the possible solutions. Partial signalisation of the roundabout intersection was also considered however, site restrictions do not allow. While the recommended solution is to replace the roundabout with linked traffic signals so that signals remain coordinated.
    Date of AwardMay 2020
    Original languageEnglish
    SupervisorSabaratnam Prathapan (Supervisor)

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