I need the answer as soon as possible Design of horizontal curves on highways, is based onO(A) Design speed of vehicles(B) Permissible friction on the road surfaceOC) Permissible centrifugal ratioO(D) All the above

Speed of vehicle, superelevation, side friction on road surface, radius are the factors…

Answered: Design of horizontal curves on…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The critical gap (in seconds) increases as the lane widths of the major road increases. a. True b. False
Find the minimum radius of a freeway that has a design speed of 120 km/hr, a maximum superelevation rate of 8% (i.e. emax= 8%). Use a maximum side friction coefficient value of 0.09 (i.e. fmax=0.09 for a design speed of 120 km/hr). Also for the same freeway, find the superelevation for a curve that has a radius of 900m. TRANSPORTATION ENGINEERING-II
-) C Problem 1.3. Calculate the minimum non-passing sight distance on a highway at a descending gradient of 6%. Given tile following data : (i) Design speed = 80 kmph (ii) Reaction time of driver = 2.5 seconds. (iii) Coefficient of friction between tyre and road surface = 0.4 pogging sight
Q- A single lane unidirectional highway has a design speed of 65kmph. The percept ion-brake-react ion time of drivers is 2.5 seconds and the average length of vehicles is 5m. The coefficient of longitudinal friction of the pavement is 0.4. the capacity of this road in terms of vehicles per hour per lane is..
35. Determine the minimum speed of a car at the point the brakes are immediately applied to avoid a collision based upon a yaw mark chord measuring 70.4 feet and a middle ordinate measuring 6 feet. The drag factor C² M of the road surface is 1.4 (Use-Mand S=√15fr ) A. 34.2 MPH B. 9.9 MPH C. 16.4 MPH D. 47.2 MPH
Estimate the horsepower required to accelerate a 2,500-lb vehicle traveling 30 mph up a 5% grade at the rate of 6 ft/sec². The vehicle has a frontal cross-sectional area of 20 ft2. The roadway has a straight alignment and a badly broken and patched asphalt surface Assume the drag coefficient = 0.3 and a rolling resistance =34 Use the following: (a) Inertia resistance, F, =? (compute) (b) Grade resistance, F =? (compute) (c) Rolling resistance, F, = 34 lb (d) Curve resistance, F = 0 (e) Air resistance; Use the formula :F= 0.0006AV² (f) Horsepower
SHOW THE DIAGRAM AND YOUR COMPLETE SOLUTION: 3. A car travelling at 90kph requires 55m to stop after the brakes have been applied. Determine the slope of the road surface of the average coefficient of friction is 0.50.
SHOW THE DIAGRAM AND THE COMPLETE SOLUTION: 2. The breaking distance for a car moving at an initial velocity of 60kph and a final of 40kph. Slope of roadway is +5% coefficient of friction between tires and pavement 0.15. Compute the breaking time required for the vehicle. Hint: breaking time V g(f+G) =
1. Consider below highway curve which has a diameter of 280 m. Determine the maximum design speed limit of a highway curve if it restricts the highway design speed to only 75%. Use super elevation (e = 0.08), Assume the value of coefficient of friction based on the table below. Determine also the highway design speed. Table 3.3 Coefficient of Side Friction for Different Design Speeds Design Speed (mi/h) Coeficients of Side Friction, f, 30 0.20 40 0.16 50 0.14 60 0.12 70 0.10 SOURCE: Adapted from A Policy on Geometric Destgn of Highways and Streets, American Association of State Highway and Transportation Officias, Washington, D.C. 2004. Used by permission. 2. If you are going to redesign the curve as to problem 1, so that its posted speed limit will be the same as the design speed of the highway, what is the new minimum radius of the new curve?
The vertical curve shown below has a design speed of 60 mph. Determine the minimum length of the curve (ft) so that it would provide adequate stopping sight distance. pvc -1.35% L = ? PUI +2.4% PVT
You have been tasked as a Highway Engineer to undertake the geometric design of the Block Factory road which is a collector road leading to AIT Seaview Campus in Accra using a design speed of 60km/hr, superelevation of 5% and trailer as design vehicle. Specify the desirable values to be employed for the following design elements: (AP,5)i. Maximum standard gradientii. Minimum vertical curve lengthiii. Minimum horizontal curve radiusiv. Curve widening amountv. Single carriageway width
H. W: A car hit a tree at an estimated speed of 35 mph on a 3% downgrade. A skid mark of 100 ft is observed on the pavement followed by 250 ft on the stabilized shoulder. Estimate the initial speed of the vehicle just before the pavement skid was begun. Use f = 0.45 for the pavement and f = 0.20 for the stabilized shoulder.

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