Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 15, Problem 9P
To determine
(a)
The length of the vertical curve using the AASHTO methods ("K "factors).
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1. A parabolic curve has an ascending grade of 4% which meets a descending grade of 3% at sta. 1+ 180 whose elevation is at 320 m. Compute the elevation of the PVT(point of vertical tangency) if the length of the curve is 280 m
2. The driver of a car traveling at 65 mph saw an obstruction ahead. If the reaction distance is 72.2 m, compute the reaction time.
A vertical curve of 600 ft connects a +4% grade to a -2% grade. The elevation of the V.P.C. is 1,250 ft. Find the elevation of the PVI., the high point on the curve, and the VP.T
A 400-ft equal-tangent sag vertical curve has its PVC at station 78+00 and elevation 800 ft. The initial grade is -4% and the final grade is +2.5%. Determine the station of the lowest point of the curve.
Chapter 15 Solutions
Traffic and Highway Engineering
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- Determine the minimum length (ft) for a vertical curve with 55mph design speed if the grades to be connected are 1.72% and -1.77%. Use the table provided by AASHTO.arrow_forwardA crest vertical curve connects a +4.44% grade and a -6.87% grade. The PVI is at station 43 + 50.00 at an elevation of 1240.00 ft. The design speed is 30 mi/h. Determine: (a) The length of the vertical curve using the AASHTO method (“K” factors) (b) The station of the BVC (c) The elevation of the BVC (d) The station of the EVC (e) The elevation of the EVC (f ) The station of the high point (g) The elevation of the high point (h) The elevation of station 44 + 23.23arrow_forwardTwo vertical parabolic curves have been connected to form a roadway by three gradients: -5.30 %, 4.10 % and -3.70 % respectively. If the length of the second curve is twice as the length of the first curve, compute the following: a. The length of the second curve in ft given that the design speed of the first curve is 80 kph assuming a vertical radial acceleration of 0.3m/s2 for comfort criterion. b. The length of the second curve in m if the headlight height of the vehicle is 0.73 m above the first curve and the inclined upward angle of the headlight beam relative to the horizontal plane of the vehicle is 1.57% The design speed for the first curve for this situation is 90 kph. c. The length of the first curve in yard if the total length of the roadway is 7451 m given that the second curve has a design speed of 70 kph for passing sight distance with the driver's eye height assumed to be 1.5 m and object height of 0.33 m. d.The total length of the roadway in km if a bridge…arrow_forward
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