A vertical curve is needed to join to tangents; G₁=0% and G₂=-5%. Assuming a level grade (0%) for braking, and the AASHTO recommended values for deceleration and perception-reaction time, calculate the minimum length of curve (ft) needed to satisfy the safety criteria. The design speed is 70 mph. Response Feedback: G2-G₁ is negative, therefore a crest curve. A=5 SSD(0%)=726.8 ft If you assume S

Structural Analysis
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A vertical curve is needed to join to tangents; G₁=0% and G₂=-5%. Assuming a level grade (0%) for braking,
and the AASHTO recommended values for deceleration and perception-reaction time, calculate the minimum
length of curve (ft) needed to satisfy the safety criteria. The design speed is 70 mph.
Response Feedback: G2-G₁ is negative, therefore a crest curve.
A=5
SSD(0%)=726.8 ft
If you assume S<L, Lmin=1224 ft. SSD less than Lmin. The assumption is good.
Transcribed Image Text:A vertical curve is needed to join to tangents; G₁=0% and G₂=-5%. Assuming a level grade (0%) for braking, and the AASHTO recommended values for deceleration and perception-reaction time, calculate the minimum length of curve (ft) needed to satisfy the safety criteria. The design speed is 70 mph. Response Feedback: G2-G₁ is negative, therefore a crest curve. A=5 SSD(0%)=726.8 ft If you assume S<L, Lmin=1224 ft. SSD less than Lmin. The assumption is good.
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