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Cost-effectiveness of enforcing axle-load regulations: The Douala-N’Djamena corridor in Sub-Saharan Africa

Author

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  • Torres Martínez, Antonio José
  • Oliete Josa, Sergio
  • Magrinyà, Francesc
  • Gauthier, Jean-Marc

Abstract

Road conditions in Sub-Saharan Africa are typically poor, and only a subset of the newly constructed or rehabilitated roads reach their design life. Truck overloading generally causes this rapid deterioration. In Africa, there are few success stories on the imposition of axle-load limits. This study examines the existing regulations on the Douala-N’Djamena international road, which is the main transport corridor in Central Africa and the backbone for internal transport in Cameroon. It benefits from the detailed existing weighing data recorded since 1998 in the corridor’s 10 weighing stations. This vast amount of traffic data, together with available information on road structure and deterioration over time, has been used to conduct an accurate calculation of load equivalency factors. The HDM 4 model has been applied to three scenarios between 2000 and 2015: (1) no axle-load control, (2) the real situation and (3) no overloading tolerance. Results show that axle-load regulations have been reasonably well applied in Cameroon and have contributed to maintaining the corridor in fair condition. In spite of the fact that significant traffic increases are presently counterbalancing the damage avoided by axle-load limits, benefits provided by axle-load control have been substantial: in the period of 2000–2015, every € invested or spent on axle-load control has generated more than €20 of savings in road user costs and in road maintenance and rehabilitation expenditure, which represents, in absolute terms, more than €500 million.

Suggested Citation

  • Torres Martínez, Antonio José & Oliete Josa, Sergio & Magrinyà, Francesc & Gauthier, Jean-Marc, 2018. "Cost-effectiveness of enforcing axle-load regulations: The Douala-N’Djamena corridor in Sub-Saharan Africa," Transportation Research Part A: Policy and Practice, Elsevier, vol. 107(C), pages 216-228.
    • Handle: RePEc:eee:transa:v:107:y:2018:i:c:p:216-228
    DOI: 10.1016/j.tra.2017.11.016
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    References listed on IDEAS

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    Cited by:

    1. Jain, Manisha & Jehling, Mathias, 2020. "Analysing transport corridor policies: An integrative approach to spatial and social disparities in India," Journal of Transport Geography, Elsevier, vol. 86(C).

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