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   Figure 5.4 the multi-functional nature.
It is also enlightening to establish a link between wealth and road infrastructure. In essence this is shown in the Figure 5.5, where a few countries of the world are compared with to eagh other.
        Figure 5.5 Relation between wealth and road infrastructure.
The precise role that roads play in economic development is complex but the fact that there is a link is widely accepted and most economists agree that investment in transport infrastructure makes a positive contribution.
For clarity we also need to define/classify different roads. This is done in table 5.1.
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