Q$3-8$: A $15-$meter wide $25$ km long highway is to be constructed between two towns. The highway is required to take $50$ msa of loading over its design life of $20$ years. The CBR of the native soil where the highway is to be built is $\backslash (3\backslash \%\backslash ).$ Sketch a design for the various layers of your pavement to fulfil this design brief. When producing your design, you should consider the fact that the sub$-$base available from the supplier for this job costs $\backslash (\backslash$$ $65\backslash )$ per $\backslash (\backslash$mathrm$\{$m$\}^\{3\}\backslash )$ and local capping material is also available for $\backslash (\backslash$$ $20\backslash )$ per $\backslash (\backslash$mathrm$\{$m$\}^\{3\}\backslash ).[10$ Marks$]$