A vertical curve with a design speed of 60 MPH has grades of -4 percent and +3 percent for the back tangent and forward tangent, respectively. An overpass located within 200 feet of the midpoint of the curve has a clearance of 15 feet. Use AASHTO recommendations for PIEV time and “normal” deceleration rate. In calculating the stopping sight distance, please use the "worst case" grade. Assume h₁ = 3.5 ft. and h₂ = 2 ft. Address the following criteria: a) Standard headlight (begin with the assumption that S > L) b) Riding comfort c) Overhead structure Based on your answers to parts a, b, and c, what should be the (minimum) length of the sag vertical curve? State all assumptions used.
A vertical curve with a design speed of 60 MPH has grades of -4 percent and +3 percent for the back tangent and forward tangent, respectively. An overpass located within 200 feet of the midpoint of the curve has a clearance of 15 feet. Use AASHTO recommendations for PIEV time and “normal” deceleration rate. In calculating the stopping sight distance, please use the "worst case" grade. Assume h₁ = 3.5 ft. and h₂ = 2 ft. Address the following criteria: a) Standard headlight (begin with the assumption that S > L) b) Riding comfort c) Overhead structure Based on your answers to parts a, b, and c, what should be the (minimum) length of the sag vertical curve? State all assumptions used.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A vertical curve with a design speed of 60 MPH has grades of -4 percent and +3 percent
for the back tangent and forward tangent, respectively. An overpass located within 200 feet
of the midpoint of the curve has a clearance of 15 feet. Use AASHTO recommendations
for PIEV time and “normal” deceleration rate. In calculating the stopping sight distance,
please use the "worst case" grade. Assume h₁ = 3.5 ft. and h₂ = 2 ft. Address the following
criteria:
a) Standard headlight (begin with the assumption that S > L)
b) Riding comfort
c) Overhead structure
Based on your answers to parts a, b, and c, what should be the (minimum) length of the sag
vertical curve? State all assumptions used.
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