![MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)](https://s3.amazonaws.com/compass-isbn-assets/textbook_empty_images/large_textbook_empty.svg)
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305581159
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
expand_more
expand_more
format_list_bulleted
Question
Chapter 15, Problem 14P
To determine
(a)
The radius of the curve.
To determine
(b)
The current maximum safe speed of the curve.
To determine
(c)
The allowable distance (minimum) between the structure proposed and the center line of the curve, such that the current maximum safe speed of the curve does not have to be reduced.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
A simple circular curve exists with a degree of curve D = 12º and e = 0.08. A
structure is proposed on land on the inside of curve. Assume the road is on level grade.
Determine:
(a) The radius of the curve
(b) The current maximum safe speed of the curve
(c) The minimum distance allowable between the proposed structure and the
centerline of the curve such that the current maximum safe speed of the
curve would not need to be reduced
(b)
For the safe road design and smooth traffic flow, combination of transition and
circular curve will be constructed to combine two tangent line that have bearing of
N 70° E (entry tangent) and S 80° E (exit tangent) respectively. With the aid of
sketch, design the minimum length of transition curve and circular curve that has
the following characteristics
• Design speed = 110 km/hr
coefficient of side friction, f= 0.15
Superelevation, e = 5 %
• Radial acceleration, c = 0.9 m/s³
A building is located 40 m from the centerline of the
inside lane as shown. The SSD (Stopping Sight Distance)
is 600 m with the length of the curve at 550 m.
Determine the following:
a.) The minimum radius of the curve
b.) The radius of the curve
L = 550 m
SSD = 600 m
40 m
R.
Rmin
Rmin
Chapter 15 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
Knowledge Booster
Similar questions
- A +2.5% grade intersects with a –1.5% grade at station (53+524.25) at an elevation of 90 m. If the design speed is 90 km/h, use AASHTO (2011) criteria to determine: The minimum length of vertical curve using the rate of vertical curvature. The stations and elevations of the BVC and EVC. The elevation of each 20-m station. The station and elevation of the highpoint.arrow_forwardThe degree of curve of a simple curve is 4^0. Compute the desired super-elevation required if the design speed of a car passing through the curve is 75kph and the skid resistance is equal to 0.12.arrow_forwardQ: A horizontal curve is being designed through mountainous terrain for a four- ane with lanes that are 3 m wide. The central angle is known to be 40 degrees, the tangent distance is 155m, and the stationing of the tangent intersection (PI) 'is 8 + 23. Under specified conditions and vehicle speed, the roadway surface is determined to have a coefficient of side friction of 0.08, and the curve's superelevation is 0.09. what is the stationing of the PC and PT and what is the safe vehicle speed?arrow_forward
- A horizontal curve through level terrain is being designed for a six-lane road with lanes that are 3.4 m wide. The central angle (Δ) is 40 degrees, the tangent distance is 155 m, and the stationing of the tangent intersection (PI) is 7 + 270.000. Under specified conditions and vehicle speed, the roadway surface is determined to have a coefficient of side friction of 0.08, and the curve’s superelevation is 7.0%. What is the stationing of the PC and PT? What is the safe vehicle speed?arrow_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_forwardSolve only first problem ..arrow_forward
- A horizontal curve with spiral is being designed for a new two-lane highway (3.6-m lanes and 2% normal crown slope) using TAC (2017) guidelines. The Point of Intersection is at station (1+134.000) and the central angle of the curve is 35°. Determine the minimum horizontal curve radius and the stations of TS, SC, CS, and ST if the design speed is 110 km/h and superelevation rate is 6%.arrow_forwardIncorrect Question 14 A simple circular curve is specified vwith a 12° degree (arc basis) horizontal curve and e=0.08. A structure is proposed on land on the inside of the curve. Assume the road is on level grade. Determine the minimum distance allowable between the proposed structure and the centerline of the curve such that the current maximum safe speed of the curve would not be reduced. (assume radius = 5001 Use coefficient of side friction = 0.13 86arrow_forwardThe degree of curve of a sample curve is 5°. Compute the desired super elevation required if the design speed of a car passing thru the curve is 80kph and the skid resistance is equal to 0.12.arrow_forward
- 12. Find the minimum length of curve for the following scenarios. Entry Grade Exit Grade Design Speed Reaction Time A 3% 8% 45 mi/hr 2.5 s В -4% 2% 65 mi/hr 2.5 s 0 % -3% 70 mi/hr 2.5 sarrow_forwardOn a two-lane NH, a curve of radius R m and length 275 m is designed to have a stopping sight distance is 120 m and width of each lane is 4.5 m. If angle of curve is 60 degree, S is set back distance, then value of S isarrow_forwardA simple curve having a degree of curve equal to 5° is connected by two tangents having an azimuth of 230° and 280° respectively. It is required to replace this curve by introducing a transition curve 80 meters long at each end of a new central curve which is to be shifted at its midpoint away from the intersection of the tangents. (a)Determine the radius of the new central curve if the center of the old curve is retained. (b)Determine the distance which the new curve is shifted away from the intersection of the tangents. (c)Compute the length of throw.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Traffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage Learning
Traffic and Highway Engineering
Civil Engineering
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Cengage Learning