2 Vertical curves A crest vertical curve is to be designed to join a 2.5% upgrade with a 3% downgrade at a section of a two-lane highway. The design speed of the highway is 55 mi/h. A. Determine the minimum length of the curve for safe stopping sight distance (demonstrate that the used formula for L satisfies the appropriate relation between L and SSD). Use design values for the PIEV time and vehicle deceleration rate once the brakes are hit. B. If the elevation of PVI point is 400 ft above the sea-level, calculate the elevation of PVC point above the sea level (Y). C. Write down the parabolic equation of the vertical curve denoting its height (Y) as a function of horizontal distance from the PVC point (x).

2 Vertical curves A crest vertical curve is to be designed to join a 2.5% upgrade with a 3% downgrade at a section of a two-lane highway. The design speed of the highway is 55 mi/h. A. Determine the minimum length of the curve for safe stopping sight distance (demonstrate that the used formula for L satisfies the appropriate relation between L and SSD). Use design values for the PIEV time and vehicle deceleration rate once the brakes are hit. B. If the elevation of PVI point is 400 ft above the sea-level, calculate the elevation of PVC point above the sea level (Y). C. Write down the parabolic equation of the vertical curve denoting its height (Y) as a function of horizontal distance from the PVC point (x).

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Intersection Design

An intersection is a location where two or more roads or railways meet or join. The traffic movement is controlled at the intersection that depends on its design and type. It governs the operation, efficiency, speed, capacity, and safety of the highways, airways, and railways. The movement of the pedestrian causes hazards and delays at the intersection.

Question

2 Vertical curves
A crest vertical curve is to be designed to join a 2.5% upgrade with a 3% downgrade at a section of a two-lane
highway. The design speed of the highway is 55 mi/h.
A. Determine the minimum length of the curve for safe stopping sight distance (demonstrate that the used
formula for L satisfies the appropriate relation between L and SSD). Use design values for the PIEV time
and vehicle deceleration rate once the brakes are hit.
B. If the elevation of PVI point is 400 ft above the sea-level, calculate the elevation of PVC point above the
sea level (Y).
C. Write down the parabolic equation of the vertical curve denoting its height (Y) as a function of horizontal
distance from the PVC point (x).
I

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