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- 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?A roadway is being design for a speed of 65 mi/h. At one horizontal curve, it is known that the super elevation is 6.0% and the coefficient of side friction is 0.18. Determine the minimum radius that will provide for safe vehicle operation in ft. * 1108.2 1176.0 O h305.1 O 1205.6 O 1107.4A 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?
- The maximum super elevation allowed by the DPWH is 0.07 and the safe limit of transverse coefficient of friction is 0.15. if the design speed of a certain highway is 85 kph, calculate the super elevation needed to maintain this speed and if it is exceeded, what would be the maximum allowable speed on this horizontal curve which has a fixed radius of 200 m.Determine the minimum radius of a horizontal curve required for a highway if the design speed is 70 mi/h and the superelevation rate is 0.08.A curve is to be designed to have a design speed of 80kph. If there is no superelevation, what would be a safe radius for the curve? If the curve is designed with a superelevation of on an urban setting at max e% what would the minimum radius of curvature?
- A freeway exit ramp has a single lane and consists entirely of a horizontal curve with a central angle of 90 degrees and a length of 190 m. If the distance cleared from the centerline for sight distance is 5.9 m, what design speed was used?A curving roadway has a curve with a radius of 580 m. The superelevation has been set at 0.05, angle of 65o and the coefficient of side friction is found to be 0.20. In addition, the traffic engineer has designed the speed as 100 km/hr.i. Explain whether this designed speed will provide a safe vehicle operation or not?ii. Find middle ordinate M,A curve has a super elevation of 15° with angle of friction 10°. What is the radius of the curve such that there will be no lateral pressure between the tires and the roadway at a maximum speed of 60mph?
- 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)Problem 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.PROBLEM 7 A +2 percent grade on an arterial highway intersects with a -1 percent grade at station 535 + 24.25 at an elevation of 300 ft. If the design speed of the highway is 65 mi/h, determine the stations and elevations of the initial point of vertical curve (PVC), the final point of vertical curve (PVT), the high point, and the elevation of each 100-ft station.