Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Question
Chapter 3, Problem 61P
To determine
The elevation difference between the west and east highway segments.
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QUESTION 1
West and east highway segments are separated by 2000 ft horizontally. The west segment has a +2.50% grade and the east segment has
a +1.60% grade. The west-grade segment ends at a higher elevation than the east segment and the two segments are connected by a
joining sag and crest curve combination (so PVT_c = PVC_s). If the road is designed for 65 mi/h, what is the elevation difference between
the west and east highway segments? State your answer in ft in the form 0.00.
1. A crest vertical curve connects a +1.5 % grade with a -2.5 % grade on a two-lane highway. The
criterion selected for design is the minimum stopping sight distance for a design speed of 90 km/h
based on AASHTO (2004) design criteria. If the grades intersect at station (14+465) at an elevation of
100 m, compute the station and elevation of BVC, EVC, and highest point. Also, compute the
elevation of the curve at 50-m intervals. Display all results in a tabular form.
Q\ on a certain highway section, a +2% grade meets a -8% at a point with an
elevation of 50m. The symmetrical parabolic curve joining the two grades provide a
safe driving speed of 120 km\hr. determine the elevation of the highest point on the
pavement surface within this section?
in
Assume a=3.41lm\sec² , S
Chapter 3 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
Ch. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7PCh. 3 - Prob. 8PCh. 3 - Prob. 9PCh. 3 - Prob. 10P
Ch. 3 - Prob. 11PCh. 3 - Prob. 12PCh. 3 - Prob. 13PCh. 3 - Prob. 14PCh. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - Prob. 17PCh. 3 - Prob. 18PCh. 3 - Prob. 19PCh. 3 - Prob. 20PCh. 3 - Prob. 21PCh. 3 - Prob. 22PCh. 3 - Prob. 23PCh. 3 - Prob. 24PCh. 3 - Prob. 25PCh. 3 - Prob. 26PCh. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - Prob. 29PCh. 3 - Prob. 30PCh. 3 - Prob. 31PCh. 3 - Prob. 32PCh. 3 - Prob. 33PCh. 3 - Prob. 34PCh. 3 - Prob. 35PCh. 3 - Prob. 36PCh. 3 - Prob. 37PCh. 3 - Prob. 38PCh. 3 - Prob. 39PCh. 3 - Prob. 40PCh. 3 - Prob. 41PCh. 3 - Prob. 42PCh. 3 - Prob. 43PCh. 3 - Prob. 44PCh. 3 - Prob. 45PCh. 3 - Prob. 46PCh. 3 - Prob. 47PCh. 3 - Prob. 48PCh. 3 - Prob. 49PCh. 3 - Prob. 50PCh. 3 - Prob. 51PCh. 3 - Prob. 52PCh. 3 - Prob. 53PCh. 3 - Prob. 54PCh. 3 - Prob. 55PCh. 3 - Prob. 56PCh. 3 - Prob. 57PCh. 3 - Prob. 58PCh. 3 - Prob. 59PCh. 3 - Prob. 60PCh. 3 - Prob. 61PCh. 3 - Prob. 62PCh. 3 - Prob. 63PCh. 3 - Prob. 64PCh. 3 - Prob. 65PCh. 3 - Prob. 66PCh. 3 - Prob. 67P
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Similar questions
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- A section of highway has vertical and horizontal curves with the same design speed. A vertical curve on this highway connects a +1% and a +3% grade and is 420 ft long. If a horizontal curve on this highway is on a two-lane section with 12-ft lanes and has a central angle of 37 degrees and a superelevation of 6%, what is the length of the horizontal curve?arrow_forward. In a design of an arterial highway, a 2.5% descending grade intersects a 3% ascending grade. The starting of a symmetrical parabolic curve, PVC that joins these two grades is at station 9 + 600 and elevation 1325.75 m. It is proposed to locate the lowest point on the curve at the proposed cross drainage structure, at station 9 + 672.727 and elevation 1324.84 m. For a design speed of 80 Km/hr; perception reaction time = 2.5 sec; and coefficient of friction = 0.3: a. Determine the length of the curve that passes through the lowest point. b. Does the curve length determined in (a) satisfy the requirements of minimum stopping sight distance and comfort? If not, what should be the curve length satisfying these requirements. c. Calculate the elevations on the curve at stations 9+640 and 9+740 assuming a carrow_forwardA crest and sag curve connect a 0% west highway segment (left) with a +1.80% east highway segment (right). The 0% west highway segment is at a higher elevation than the start of the +1.80% east highway segment. The two vertical curves connect with each other (PVŤ = PVCG) and share a 2.2% (use -2.2% for calculation) common grade. If the design speed of the curves is 60 mi/h. What the elevation difference (ft, use format 0.00, range is +/-0.02) between the two road segments?arrow_forward
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