3.3 Vertical Alignment 53 ELEMENTS OF VERTICAL CURVE DESIGN An equal-tangent vertical curve is to be constructed between grades of -2.0% (initial) and +1.0% (final). The PVI is at station 110+ 00 and at elevation 420 ft. Due to a street crossing the roadway, the elevation of the roadway at station 112 + 00 must be at 424.5 ft. Design the curve.
3.3 Vertical Alignment 53 ELEMENTS OF VERTICAL CURVE DESIGN An equal-tangent vertical curve is to be constructed between grades of -2.0% (initial) and +1.0% (final). The PVI is at station 110+ 00 and at elevation 420 ft. Due to a street crossing the roadway, the elevation of the roadway at station 112 + 00 must be at 424.5 ft. Design the curve.
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 21P
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Handwritten answers pls. I don’t like the way the textbook solution did it, it’s confusing.

Transcribed Image Text:From Eq. 3.3,
ELEMENTS OF VERTICAL CURVE DESIGN
An equal-tangent vertical curve is to be constructed between grades of -2.0% (initial) and
+1.0% (final). The PVI is at station 110+ 00 and at elevation 420 ft. Due to a street
crossing the roadway, the elevation of the roadway at station 112 + 00
must be at 424.5 ft. Design the curve.
The design problem is one of determining the length of the curve required to ensure that
station 112+00 is at elevation 424.5 ft. To begin, we use Eq. 3.1:
y = ax² +bx+c
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