$3\mathrm{.}4$ Given: road category B$,$ falls under a dry region, design CBR $=14\%,$ and cumulative traffic per design lane over $20$ years SDP $=3\mathrm{.}9$ million E$80$s$.$

$3\mathrm{.}4\mathrm{.}1$ Use TRH$4$ method to provide all possible alternative pavement structures. Show your work on the design catalogues. Also check your designs against Table $19.$

$(20)$