A vertical curve is needed to join to tangents; G₁=2% and G2-5%. Assuming the worst case scenario for braking, and the AASHTO recommended values for deceleration and perception-reaction time, calculate the minimum length of curve (ft) needed to satisfy the appearance criteria. The design speed is 50 mph. Response Feedback: G2-G₁ is positive, therefore a sag curve. A=3 Lmin=100A

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A vertical curve is needed to join to tangents; G₁=2% and G2-5%. Assuming the worst case scenario for
braking, and the AASHTO recommended values for deceleration and perception-reaction time, calculate the
minimum length of curve (ft) needed to satisfy the appearance criteria. The design speed is 50 mph.
Response Feedback: G2-G₁ is positive, therefore a sag curve.
A=3
Lmin=100A
Transcribed Image Text:A vertical curve is needed to join to tangents; G₁=2% and G2-5%. Assuming the worst case scenario for braking, and the AASHTO recommended values for deceleration and perception-reaction time, calculate the minimum length of curve (ft) needed to satisfy the appearance criteria. The design speed is 50 mph. Response Feedback: G2-G₁ is positive, therefore a sag curve. A=3 Lmin=100A
Expert Solution
Step 1

Given :-

Vertical curve

Grade of first tangent , G1 =2%

Grade of second tangent , G2 = 5%

Design speed, V = 50 miles per hour.

Appearance criteria is needed to be satisfied.

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