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.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter15: Geometric Design Of Highway Facilities

Section: Chapter Questions

Problem 19P

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