Standard speed limit on Addis Ababa Midblock ring road is 80km/h. However, most of the vehicles speed exceed this limit or short fall this limit; because, heavy vehicles are complex in operation than light vehicles and heavy vehicles cover wide space to change a lane. Severity of crash between heavy and light vehicle is higher than crash between light and light vehicles or crash between heavy and heavy vehicles. The main objective of this study is to identify impacts of common lane utilization of heavy and light vehicles on the performance of Addis Ababa midblock ring roads. Pre-tested self administered questionnaire, developed format to collect secondary data and scenarios were developed from collected videos. Statistical analysis was used to evaluate the result. Out of six causes of crash (illegally using opposite lane, unavailability of enough headway, illegal overtake, unacceptable driving backward, illegal lane change and vehicle out of control) majority (40.4%) were caused by illegal lane change. Out of three types of vehicle-vehicle conflict (heavyheavy, heavy-light and Light-Light); 46% were heavy-light vehicle conflict, 44% were Light-light vehicle conflict and 9.6 % were heavy-heavy vehicle conflict. From this; frequency of heavy-light vehicle conflicts was higher than other combinations (Light-light vehicle conflict and heavy-heavy vehicle conflict). 54% of Light-light vehicle conflicts were because of illegal lane change and 38% of heavy-light vehicle conflicts were because of insufficient headway. These indicate that; light vehicles following heavy vehicles enforced to change lane. From video analysis result, when light vehicles following heavy vehicles was 67.6km/hr but the mean speed of rear vehicles speed becomes 80.77km/hr when light vehicles follow light vehicles. These specify that; road segment with light vehicle following light vehicle is significantly improving performance as compared to light vehicle following heavy vehicle. From three scenarios developed by simulation analysis (VISSIM 9); In scenario 1(Light vehicle follow only Light vehicle, removing heavy vehicles from the midblock ring road) there was no average vehicles delay and only 0.21 sec. total vehicles delay were observed. In scenario 2(Lane restriction, restricting heavy vehicles to the outer lane of the midblock ring road) average vehicles delay was 0.06sec, and 50.43 sec total delay were observed. In scenario 3 (common lane utilization, both light and heavy vehicles utilize the same lane) 1.2sec average vehicles delay and 200.2 sec total vehicles delay were detected. From these when light and heavy vehicles utilize the same lane average and total vehicles delay were higher than other scenario which shows that performance of the ring road decreased in common lane utilization option. The research concludes that presence of heavy vehicles with light vehicles on the same lane of Addis Ababa midblock ring road decreases performance of the ring road. Therefore it is recommended to develop policy which is lane restriction for heavy and light vehicles on midblock ring roads


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    Titel :

    EVALUATION OF THE IMPACTS OF COMMON LANE UTILIZATION OF HEAVY AND LIGHT VEHICLES ON PERFORMANCE OF ADDIS ABABA MID BLOCK RING ROADS


    Beteiligte:
    ANBESSA BEKELE (Autor:in) / ASHENAFI AREGAWI (Autor:in)

    Erscheinungsdatum :

    2018-01-01


    Anmerkungen:

    doi:10.20372/nadre:1550996897.96



    Medientyp :

    Hochschulschrift


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    DDC:    535 / 629





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