PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Question
Chapter 3, Problem 5P
To determine
The station and elevation of the high point.
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Students have asked these similar questions
3.5 An equal-tangent crest curve has been designed for
70 mi/h to connect a +2% initial grade and a -1% final
grade for a new vehicle that has a 3 ft driver's eye
height; the curve was designed to avoid an object that is
1 ft high. Standard practical stopping distance design
was used but, unlike current design standards, the
vehicle was assumed to make a 0.5g stop, although
driver reactions are assumed to be the same as in current
highway design standards. If the PVC of the curve is at
elevation 848 ft and station 43+ 48, what is the station
and elevation of the high point of the curve?
Calculate the minimum length of a crest vertical curve for a two lane highway with an initial grade of +3.5% and a final grade of -2% based on a Passing Sight Distance (PSD) of 700 ft (i.e. corresponding to a design speed of 45 mph). For Passing Sight Distance, AASHTO 2011 policy assumes a driver eye height above the roadway of 3.5ft (i.e. h1) and an object height of 3.5 ft (i.e. h2).
TRANSPORTATION ENGINEERING-II
A car is traveling up a 1.25% grade of a crest
curve with a design speed of 65 mph. The
descending grade is -2.75%. What is the
required length of curve for minimum proper
stopping sight distance?
AASHTO Minimum Stopping Sight Distances on Level Roadways (based on braking distance)
stopping sight distance
design speed
(mph)
braking distance
on level
(ft)
design
(ft)
(m)
brake reaction distance
calculated
(km/h)
(ft)
(m)
(m)
(ft)
(m)
(20)
(30)
(40)
(50)
(60)
(70)
(80)
(90)
(100)
(110)
(120)
(130)
(13.9)
(20.9)
(27.8)
(34.8)
(41.7)
(48.7)
(55.6)
(62.6)
(69.5)
(76.5)
(83.4)
(90.4)
(4.6)
(10.3)
(18.4)
(28.7)
(41.3)
(56.2)
(73.4)
(92.9)
(114.7)
(138.8)
(165.2)
(193.8)
(18.5)
(31.2)
(46.2)
(63.5)
(83.0)
(104.9)
(129.0)
(155.5)
(184.2)
(215.3)
(248.6)
(284.2)
(20)
(35)
(50)
(65)
(85)
(105)
(130)
(160)
(185)
(220)
(250)
(285)
15
55.1
21.6
76.7
80
20
73.5
38.4
111.9
115
25
91.9
60.0
151.9
155
30
110.3
86.4
196.7
200
35
128.6
117.6
246.2
250
40
147.0
153.6
300.6
305
359.8
423.8
45
165.4
194.4…
Chapter 3 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
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
- A horizontal curve is to be designed for a section of a highway having a design speed of 60 mi/h. (a) If the physical conditions restrict the radius of the curve to 500 ft, what value is required for the superelevation at this curve?(b) Is this a good design?arrow_forward3. A curve of radius 250 ft and e= 0.08 is located at a section of an existing rural highway, which restricts the safe speed at this section of the highway to 50% of the design speed. This drastic reduction of safe speed resulted in a high crash rate at this section. To reduce the crash rate, a new alignment is to be designed with a horizontal curve. Determine the minimum radius of this curve if the safe speed should be increased to the design speed of the highway. Assume fs=0.17 for the existing curve, and the new curve is to be designed with e = 08.?arrow_forwardA freeway exit ramp has a single lane and consists entirely of a horizontal curve with a central angle of 90 degrees and a length of 190 m. If the distance cleared from the centerline for sight distance is 5.9 m, what design speed was used?arrow_forward
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