Answer Happy

Question 4 a) As depicted in Figure 3, the sight distance (S) on a horizontal curve is found to be within the length of the curve. If the radius of the curve (R) is half of the sight distance and the offset distance (m) of an obstruction from the curve is x/6, determine the adequacy of the offset distance of the obstruction from the curve. Sight distance s Eye iii. Camber iv. Lane width R i. Minimum right-of-way ii. Shoulder width Line of sight Obstruction Figure 3: Sight distance on horizontal curve Major Topic 8: Horizontal Alignment Design Major Topic 9: Cross Section Design R Object b) Specify the desirable values of the under listed cross sectional elements for an urban surface dressed single carriageway collector road in Ghana to be designed at a speed of 65km/hr Major Topic 8: Horizontal Alignment Design Blooms Designation: AN Score: 7 Blooms Designation: AP Score: 7 c) A horizontal curve on a 2-lane two-way highway is designed at a radius of 150m with the design vehicle being a large vehicle. As per the requirements of the GHA Road Design Guide, would you recommend curve widening? Give reasons for your answer. Blooms Designation: Score: AP 6 TOTAL SCORE: 20