Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Question
Chapter 3, Problem 16P
To determine
(a)
Super-elevation of the curve.
To determine
(b)
Whether super-elevation for the curve is safe or not.
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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?
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?
What will be the ruling radius of a horizontal curve on a National Highway for a design
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- What is the appropriate super elevation rate for a curve with a 1,200-ft radius on highway with a design speed of 60 mi/h? The maximum design super elevation is 6% for this highway.arrow_forwardA section of highway has vertical and horizontal curves with the same design speed. A vertical sag 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 12ft lanes, has a central angle of 37 degrees, and has a superelevation of 6%, what is the length of the horizontal curve?arrow_forwardA horizontal curve in an urban area is being designed for 40 mph. If there is a maximum radius of 500 feet, what is the necessary super-elevation? Is this value feasible?arrow_forward
- A 300 m radius highway curve is to be superelevated so that skidding will not be impending at speeds below km 100 . If the minimum u is assumed to be 0.2, what superelevation in mm is required for a 8 m roadway? hr What will be the most comfortable speed for the passengers on this curve if it has the superelevation found above?arrow_forwardProblem 5 An existing horizontal curve on a highway has a radius of 465 ft, which restricts the posted speed limit to only 61.5% of the design speed on this section of the highway. If the curve is to be improved, so that its posted speed will be the design speed of the highway, determine the minimum radius of the new curve. Assume that the rate of superelevation is 0.08 for both the existing curve and the new curve to be designed and f,=0.16 for 40 mph, 0.14 for 50 mph, 0.12 for 60 mph, and 0.10 for 70 mph.arrow_forwardA large grain elevator is located 40 ft from the centerline of a two- lane highway, which has 12-ft lanes. The elevator is situated on the inside of a l12° horizontal curve. a) Assuming that the elevator is the only sight restriction on the curve, what is the minimum sight distance along the curve? b) What should be the maximum speed recommended for this curve? c) If the designer wants to have the design speed of 10 mph higher that the recommended speed, what is the distance required for the movement of the elevator?arrow_forward
- What is the minimum radius of a horizontal curve required for a highway if the design speed is 55 mph and the superelevation rate is 7%? Use AASHTO tablEarrow_forwardEngineers group have been decided to design a highway with vertical curve in order to transfer the traffic volume through it, with a (1.90) percent grade meting (- 3.90) percent grade. The vertical curve length (984.00) ft. (Use fSkidding= 0.35, t = 2.5 sec.), sight distance you :recommended is 677 ft. 505 m. O 605 ft. O 650 ft. O 600 ft. Oarrow_forwardA 2-lane (12 ft wide lanes) with a horizontal and a crest vertical curve is reportedly designed for 35 mph. Both curves begin at point A and end at point B. Given the data below, is this section of roadway adequately designed for 35 mph? Show appropriate calculations to support your conclusion. Horizontal Curve Data Curve length - 390 ft • 60° angle as shown 4% superelevation M,- 25 ft (perpendicular distance from centerline of inside Vertical Curve Data Curve length - 390n G = 6% • G-3.5% lane to nearest obstruction) 60° Plan View Profile Viewarrow_forward
- i need an answer asap. Complete solution. Subject: highway and railroad engineeringarrow_forwardThe radius of a horizontal curve on an existing highway was field- measured to be 275 m. The on this two-lane pavement highway is 6.8 m wide, and the elevation difference between the inside edge and outside edge of the curve is 0.544 m. The posted speed limit on the road is 100 km/h. Determine the minimum radius of curvature to permit safe operation at the speed limit. 1arrow_forwardA curve of radius 76 m 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. The new curve is to be designed with the same superelevationarrow_forward
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