Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Question
Chapter 3, Problem 17P
To determine
The required minimum radius of a horizontal curve for the given design speed.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
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 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 1107.4
Compute the minimum radius of a circular curve for a highway designed for 80 km/h. Because snow and ice are present, the maximum superelevation rate is 8%.
Chapter 3 Solutions
Traffic and Highway Engineering
Knowledge Booster
Similar questions
- 1. The superelevation of a highway is 0.15. Compute the degree of the curve if the design speed of the car passing through the curve is 90kph and the skid resistance is 0.10.arrow_forwardThe design speed of a highway is 80 km/h. There is a horizontal curve of radius 200 m in a certain locality. What should be the superelevation required to maintain this design speed? If the maximum superelevation of 0-07 is not to be exceeded, what should be the maximum allowable speed on this curve ? Also determine the extra widening required and length of transition curve using the following data: Length of wheel base of the largest vehicle = 6-1 m Pavement width=7-2 m Number of lanes = 2 Rate of introduction of superelevation = 1 in 200 Type of terrain Plain Safe limit of coefficient of friction = 0.15arrow_forwardA roadway is being designed for a speed of 60 mi/h. At one horizontal curve, it is known that the superelevation is 7.0% and the coefficient of side friction is 0.10. Determine the minimum radius of curve (measured up to the traveled path) that will provide for safe vehicle operation. Use g = 32.2 ft/sec2arrow_forward
- 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.arrow_forwardExample 3 The design speed of the highway is ranging from 100 - 120KM/h. The initial and final grades are G1= 2.5% & G2 = -1.5% Calculate corresponding minimum length of the vertical curve that satisfies the minimum stopping sight distancearrow_forwardA. 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)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_forwardAn existing horizontal curve has a radius of 85 metres which restricts the maximum speed on this section to only 60% of the design speed of the highway. Highway officials want to improve the road to elimintare this bottleneck. Assume coefficient of side friction is 0.15 and rate of superelevation is 8%. Compute the existing speed, design speed and new radius of curvature.arrow_forwardAn existing horizontal curve has a radius of 85 meters, which restricts the maximum speed on this section of road to only 60% of the design speed of the highway. Highway officials want to improve the road to eliminate this bottleneck. Assume coefficient of side friction is 0.15 and rate of superelevation is 0.08. Compute the existing speed, design speed, and find the new radius of curvature.arrow_forward
- 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,arrow_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_forwardYou've been asked to design a vertical curve for an expressway that joins a +4% grade with a -2% grade. The design speed for this expressway is 50 mi/h, the perception- reaction timet= 2.5 sec, and the deceleration rate for braking a = 11.2 ft/sec. What is the minimum length of curve for this section if SSDarrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_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