This manual presents the Roads Economic Decision Model (RED) developed to improve the decision-making process for the development and maintenance of low-volume rural roads.
Road transport is the dominant mode of transport in sub-Saharan Africa, carrying close to 90 percent of the region's passenger and freight transport, and providing the only access to rural communities where over 70 percent of Africans live. Despite their importance, most of the region's nearly 2 million km of roads are poorly managed and badly maintained. By 1990, nearly a third of the $150 billion invested in roads had been eroded through lack of maintenance.
This Note presents the Roads Economic Decision Model (RED) that performs an economic evaluation of road investments and maintenance options customized to the characteristics of low-volume roads such as: a) high uncertainty of the assessment of traffic, road condition, and future maintenance of unpaved roads; b) periods during a year with disrupted passability; c) levels of service and corresponding road user costs defined not lonely through roughness; d) high potential to influence economic development; and e) beneficiaries other than motorized road users.