Q2.1 A simple, right-hand circular curve is used as part of the horizontal alignment of...
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Q2.1 A simple, right-hand circular curve is used as part of the horizontal alignment of a 2-lane, two-way rural road. The design speed is selected as 80 km/h. The simple circular curve has a central angle (A) of 65 00' 0.0", superelevation of 5%, lane width of 3.4 m, shoulder width of 1.2 m, cambered to 2%, begins at chainage 1100.750 (1+100.750) and ends at chainage 1500.750 (1+500.750). Assume a superelevation development length of 60 m and one-third of the runoff length is in the curve. 2.1.1 Calculate the curve length, curve radius and tangent length. 2.1.2 calculate the chainage corresponding to a deflection angle of 16 30' 0.0". (3) (2) Q2.2 Refer to the curve in Q2.1. Use the information given in the table below and do any necessary calculations, draw a neat labelled sketch to show the superelevation diagram out the curve. (10) 60 Superelevation development length (m) Crown runoff length (m) Chainage at normal camber (m) Chainage at full superelevation (m) 2%*60/5% = 24 1564.750 1480.750 0% 2% W w = 0.092 m 4.6 m 4.6 m
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