Assignment task: Design a double seal of 20.0 mm stone and 10.0 mm stone for the N2 National Route between Durban and Pietermaritzburg. The predicted traffic is 4000 light vehicles and 400 heavy vehicles per lane per day. Aggregate properties are; 20.0 mm stone: ALD = 9.2 mm, flakiness is 10%; 10.0 mm stone: ALD = 4.2 mm, flakiness is 20%. Aggregate spread rate = medium dense matrix. Penetration values (corrected) averaged 1.5 mm. The steepest gradients are 5%, the existing texture depth is 0.45 mm required texture depth is 0.5 mm. The Binder specification is as follows: Tack Coat is Polymer-modified bitumen S-E1, and Penetration Coat is Polymer-modified bitumen S-E2. Distribution of binder tack coat: penetration coat is 50:50