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Question 3 3.1 A circular curve is used as part of the horizontal alignment of a 2-lane, one way road. The curve has central angle (A) = 83° 7' 28.8”, Pl chainage = 0+905.280 and BC chainage =0 +639.280. Calculate the following: 3.1.1 The curve radius, curve length and EC chainage. 3.1.2 The deflection angle at chainage 1+040.000 3.1.3 The curve total widening requirement if the design vehicle is articulated bus. (6) (4) 3.2 A horizontal curve is used in a 2-lane, two-way rural road. The design speed is 100 km/h and curve radius is 700 m. Calculate the required superelevation rate. Also, provide a comment on the result (Hint: Consult TRH17 and estimate the value for lateral coefficient of friction). (3) 3.3 For the horizontal curve in Q 3.2, determine the curve radius if the maximum superelevation is 8% and free-steering condition is considered. (2)