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    Volume 47, Issue 3 (October 2018)

    Special Issue Paper

    Assessment of Traffic Data for Road Rehabilitation Design: A Case Study of the Korogwe-Mombo Road Section in Tanzania

    (Received 30 January 2018; accepted 21 June 2018)

    Published Online: 11 October 2018

    CODEN: JTEVAB

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    Abstract

    Traffic loading is one of the key inputs for new and rehabilitation designs of pavement. Heavy vehicles cause the most structural damage to pavements; hence, as part of the pavement design process, heavy vehicle volume and axle load surveys are typically carried out to assist with the accurate estimation of the cumulative traffic loading over a design period. Traffic volumes, axle loads, and the ultimate cumulative traffic loading often fluctuate because of factors such as varying motorist population and economic activities along the length of the road. This article presents a comparative assessment of traffic loading estimated for the rehabilitation design in 2005 and the actual measured site-specific traffic loading in 2015. The design traffic loading was also compared with the projected future traffic loading for the Korogwe-Mombo road section along the T2 trunk road that connects Tanzania’s business hub of Dar es Salaam with the northern regional cities. The study found, inter alia, that the cumulative traffic loading based on the 2015-measured site-specific traffic data is approximately 2.8 times higher than the design traffic loading based on the 2005 traffic data, which illustrates the importance of using accurate and reliable site-specific traffic data during pavement design. The implications of the findings for rehabilitation design are presented in this article, along with discussions on the contribution of heavy traffic loading to rutting/permanent deformation that occurred on the surface asphalt layer along the Korogwe-Mombo road section. To improve the accurate determination of traffic loading, traffic studies should ideally be conducted over a long period (typically over 1 year). However, this is not practical and cost effective when traditional manual methods are used. Hence, it is recommended that road agencies should consider the use of portable automated traffic and Weigh-In-Motion monitoring systems.

    Author Information:

    Komba, Julius J.
    Transport Infrastructure Engineering, Council for Scientific and Industrial Research/University of Pretoria, Pretoria,

    Mataka, Mussa
    Tanzania National Roads Agency/Central Materials Laboratory, Dar es Salaam,

    Malisa, John T.
    Tanzania National Roads Agency/Central Materials Laboratory, Dar es Salaam,

    Walubita, Lubinda F.
    Texas A&M Transportation Institute, Texas A&M University System, College Station, TX

    Maina, James W.
    University of Pretoria, Hatfield,


    Stock #: JTE20180072

    ISSN:0090-3973

    DOI: 10.1520/JTE20180072

    Author
    Title Assessment of Traffic Data for Road Rehabilitation Design: A Case Study of the Korogwe-Mombo Road Section in Tanzania
    Symposium ,
    Committee D04