Problem 4 Combined Design - Grade Separated Intersection (20 marks) In the local government area of Osage", a new highwa

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Problem 4 Combined Design Grade Separated Intersection 20 Marks In The Local Government Area Of Osage A New Highwa 1 (36.94 KiB) Viewed 48 times

Problem 4 Combined Design - Grade Separated Intersection (20 marks) In the local government area of Osage", a new highway (Langmore Highway is to be constructed over the existing "Byrde Highway. The following conditions apply to the site Langmore Highway and Byrde Highway intersect at night angles (90 degrees • As the highways are grade-separated (Langmore Highway bridges over de Highway) there is a desirable clearance height of om between the two highways. • Both highways are at a level grade (constant elevation). • Langmore Highway is oriented east-west at an elevation of 177m. The bridge structure is such that the bridge girder thickness is 2m (measured from the road surface to the bottom of the girder) • A single-lane ramp is to be constructed to allow eastbound traffic to go outbound A single horizontal curve, with a central angle of 90 degrees, is to be used in transition curve is designed). The design speed for the curve is set at 80mh anda required superelevation is 5% Figure 2 and Figure 3 present diagrams of the alignment of the two highways, LANGNORE S Figure 2: HorizontalAlignment of Langmore Highway and Byrde Highway 49106: Road Engineering Practice - Assessment Task 2 LANGMORE HIGHWAY PVC PVT PVC PVT VerticalAlig Figure 3: VerticalAlignment of Langmore Highway and Byrde Highway Using the Austroads Guide to Road Design Part 3 Geometric Design, determine the folowing features of the grade separated intersection design: a) Stationing of TC, PI, CT, assuming the curve begins at station 4+275.000 (5 mark b) Stationing and elevation of all key points (PVC, PVI and PVT for each designed vertical curve) along the vertical alignment (50 marks c) The distance that must be cleared from the inside of the horizontal curve so that the line of sight is sufficient to provide adequate stopping sight distance (5 maria