Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Question
Chapter 3, Problem 52P
To determine
The design speed for the horizontal curve.
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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 freeway exit ramp has a single 12-ft lane and consists entirely of a curve with a centralangle of 30 degrees. If the distance cleared of obstacles is 19.4 ft from the centerline, whatdesign speed was used?
A two-lane minor road intersects a two-lane undivided major road at 90 degrees,forming a four-leg intersection with traffic on the minor road controlled by a yield sign. A building islocated 185ft from the center line of the outside lane of the major road. The design speed on themajor road is 60 mi/h and the design speed on the minor is 35 mi/h. The approach grade on the minorroad is 3%. A passenger car on the minor road would like to cross the major road. Using theAASHTO procedure, determine the minimum distance required that the building must be from thenearest lane on the minor road
Chapter 3 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
Ch. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7PCh. 3 - Prob. 8PCh. 3 - Prob. 9PCh. 3 - Prob. 10P
Ch. 3 - Prob. 11PCh. 3 - Prob. 12PCh. 3 - Prob. 13PCh. 3 - Prob. 14PCh. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - Prob. 17PCh. 3 - Prob. 18PCh. 3 - Prob. 19PCh. 3 - Prob. 20PCh. 3 - Prob. 21PCh. 3 - Prob. 22PCh. 3 - Prob. 23PCh. 3 - Prob. 24PCh. 3 - Prob. 25PCh. 3 - Prob. 26PCh. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - Prob. 29PCh. 3 - Prob. 30PCh. 3 - Prob. 31PCh. 3 - Prob. 32PCh. 3 - Prob. 33PCh. 3 - Prob. 34PCh. 3 - Prob. 35PCh. 3 - Prob. 36PCh. 3 - Prob. 37PCh. 3 - Prob. 38PCh. 3 - Prob. 39PCh. 3 - Prob. 40PCh. 3 - Prob. 41PCh. 3 - Prob. 42PCh. 3 - Prob. 43PCh. 3 - Prob. 44PCh. 3 - Prob. 45PCh. 3 - Prob. 46PCh. 3 - Prob. 47PCh. 3 - Prob. 48PCh. 3 - Prob. 49PCh. 3 - Prob. 50PCh. 3 - Prob. 51PCh. 3 - Prob. 52PCh. 3 - Prob. 53PCh. 3 - Prob. 54PCh. 3 - Prob. 55PCh. 3 - Prob. 56PCh. 3 - Prob. 57PCh. 3 - Prob. 58PCh. 3 - Prob. 59PCh. 3 - Prob. 60PCh. 3 - Prob. 61PCh. 3 - Prob. 62PCh. 3 - Prob. 63PCh. 3 - Prob. 64PCh. 3 - Prob. 65PCh. 3 - Prob. 66PCh. 3 - Prob. 67P
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- How much space should be cleared between an obstruction and the center of a roadway (in ft) for a horizontal curve with 2-11 ft lanes if the design speed is 67 mph and the radius of the curve is 1,037?arrow_forwardA car is traveling up a 1.25% grade of a crest curve with a design speed of 65 mph. The descending grade is -2.75%. What is the required length of curve for minimum proper stopping sight distance? AASHTO Minimum Stopping Sight Distances on Level Roadways (based on braking distance) stopping sight distance design speed (mph) braking distance on level (ft) design (ft) (m) brake reaction distance calculated (km/h) (ft) (m) (m) (ft) (m) (20) (30) (40) (50) (60) (70) (80) (90) (100) (110) (120) (130) (13.9) (20.9) (27.8) (34.8) (41.7) (48.7) (55.6) (62.6) (69.5) (76.5) (83.4) (90.4) (4.6) (10.3) (18.4) (28.7) (41.3) (56.2) (73.4) (92.9) (114.7) (138.8) (165.2) (193.8) (18.5) (31.2) (46.2) (63.5) (83.0) (104.9) (129.0) (155.5) (184.2) (215.3) (248.6) (284.2) (20) (35) (50) (65) (85) (105) (130) (160) (185) (220) (250) (285) 15 55.1 21.6 76.7 80 20 73.5 38.4 111.9 115 25 91.9 60.0 151.9 155 30 110.3 86.4 196.7 200 35 128.6 117.6 246.2 250 40 147.0 153.6 300.6 305 359.8 423.8 45 165.4 194.4…arrow_forwardA-1.7% grade intersects a 3.6% grade on a highway with a design speed of 55 mph. What is the length of the curve in ft required? (Assume provisions are to be made for minimum stopping sight distance).arrow_forward
- A 4-lane divided highway has a highway grade of -1.5%. The minor road approach grade is 3.5%. The design speed is 45 mph for the major road and 40 mph for the minor road. Find the left turn departure sight distance for a passenger car turning left from the minor road to the major road, The answer should be in feet.arrow_forwardEngineers group have been decided to design a highway with vertical curve in order to transfer the traffic volume through it, with a (1.90) percent grade meting (- 3.90) percent grade. The vertical curve length (984.00) ft. (Use fSkidding= 0.35, t = 2.5 sec.), sight distance you :recommended is 677 ft. 505 m. O 605 ft. O 650 ft. O 600 ft. Oarrow_forwardA parabolic sag vertical curve is formed when a rural highway passes under a bridge joining a -6% grade to the horizontal grade. The vertical point of intersection of these two grades lies 3 feet below the curve. If the vertical clearance of the underpass is only 10 feet, what speed limit would you suggest should be imposed at this spot, considering a safe stopping sight distance? Use H=3.5 ft, β= 1.50; assume vehicle deceleration rate of 13.5 ft/s2 and driver’s perception-reaction time of 2.5 seconds.arrow_forward
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