A horizontal curve extends 750 ft along the centerline it has a radius of a 10 degree the roads is 20 ft wide with 2 ft shoulder design speed is 50 mph find the required horizontal sightline offset that trees can be removed from the edge of the road.....?
Please the question carefully and gave me a solution that I need with a full explanation and step by step.
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Homework Answers
Given,
Degree of curve = 10o
Radius = 5729.6/D = 5729.6/10 = 579.26 ~ 580 ft
Road width = 20 ft
Shoulder width = 2 ft
Design speed = 50 mph = 73.33 ft/s
SSD = V*t + V2/2a = 73.33 * 2.5 + 73.332/(2 * 11.2) = 183.325 + 240.058 = 423.383 ~ 425 ft
Required horizontal sight line offset from the edge of the road = R (1 - cos (28.65 S/R))
= 580 (1 - cos (28.65 * 425/580)) = 38.4999 ~ 38.5 ft
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