3.4 The table below shows the transition points into and out of a lefthand curve designed as part of a 2-lane, two-way r

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3 4 The Table Below Shows The Transition Points Into And Out Of A Lefthand Curve Designed As Part Of A 2 Lane Two Way R 1 (118.53 KiB) Viewed 37 times

3.4 The table below shows the transition points into and out of a lefthand curve designed as part of a 2-lane, two-way rural road. The straight sections of the road are crowned to 2%. The curve length is 350 m, lane width is 3.4 m, shoulder width is 0.8 m, required superelevation is 5% and BC chainage is 5+100.300. Assume run off length of 60 m and one-third of the transition is in the curve. Transition into the curve Begin right lane transition 5036.300 Right lane crosses 0 % 5060.300 Begin left lane transition 5084.300 Attainment of full super-elevation 5120.300 Transition out of the curve End of full superelevation 5430.300 Left lane crosses 0% 5490.300 End of left lane transition 5466.300 End of transition (crown section) 5514.300 3.4.1 Draw a neat, labelled sketch to show the full superelevation diagram. Your sketch should clearly indicate for chainages of transition points, superelevation development lengths, edges and centreline, difference in height between edges and centreline. (11) 3.4.2 Determine the cross-fall of the road section at BC. (3) 3.4.3 Calculate the length of the curve that is fully superelevated. (2) [35 marks]