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

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

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter15: Geometric Design Of Highway Facilities

Section: Chapter Questions

Problem 21P

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A simple circular curve exists with a degree of curve D = 12⁰and e = 0.08. A structure is proposed on land on the inside of curve. Assume the road is on level grade. Determine: (i) The radius of the curve (ii) The current maximum safe speed of the curve (iii) 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.
Q: 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?
(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
The 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.
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.
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?
A section of a two-lane, two-way highway (2 @ 3.5 m) is to be designed with a circular curve. Sta. Pl at 200 + 100.000 Design speed = 60 kph Intersection angle = 40 degrees Rate of change of acceleration: 0.5 m/sec2
An easement spiral curve has design speed of 100 kph. The radius of the central curve is 336.2 m with a permissible super elevation of 0.07. Compute: a. The velocity of the car as it approaches the transition curve; b. The length of the transition curve to limit the centrifugal acceleration; c. The length of the short tangent of transition curve.
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 s
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%.
A. A curving roadway has a curve with a radius of 640 m. The superelevation has been set at 5% and the coefficient of side friction is found to be 0.20. In addition, the traffic engineer has designed the speed as 125 km/hr, and the angle is 74°. i. Explain whether this speed will provide a safe vehicle operation or not? ii. Find middle ordinate iii. Curve length iii. Tangent Length v. Sketch the curve elements with all values B. Describe the major elements that geometric design of highways deals with? (write between 100-150 words)
Two 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…