$1.$ The right angle intersection of two$-$lane regional roads is to be upgraded. Due to the moderate volumes of traffic carried by the roads $($including turning movements$),$ one$-$quadrant interchange is suggested. The design speeds for the roads with higher volume is $90$ km$/$hr and for the other is $60$ km$/$hr$.$ The topography is rough. Design and draw the interchange. Show a plan, profile and the necessary channelization. Consider SU as the design vehicle.

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