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 53P
To determine
The maximum safe speed to the nearest
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A horizontal curve on a four-lane (two lane in each direction) highway (11-ft lanes) has PC at station 124+30 and PT at station 130 + 15. The central angle is 40
degrees, the superelevation is 0.12, and 23.5 ft is cleared (for sight distance) from the inside edge of the innermost lane. Determine a maximum safe speed
(assuming current design standards) to the nearest 5 mi/h.
Qg:- A horizontal curve with a radius of 200 m forms part of a two-lane highway with a
posted speed of 50 Kph. Determine:
1)) The distance a house can be placed from the centerline of the inside of the curve
without reduced the required stopping sight distance?
2)) Length of circular curve ?
Assume perception reaction time is 2.5 sec., the highway is flat, lane width = 4 m,
and central angle A = 25°.
The design speed for a two-lane highway (lane width=12 ft.) is 60 mph. The localjurisdiction governs 8% superelevation. The central angel of the curve is 40 degrees. The PI station is at 452+50.What is the curve radius to the travel path (R)? What is the curve radius (R)? What is the curve length (L)? What isthe station of PC? What is the station of PT? What is the SSD? How many feet must be cleared from the lane'sshoulder edge to provide adequate stopping sight distance?
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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- A two-lane rural highway has a horizontal curve segment that must have a radius of 329 ft (measured to the centerline that separates the two lanes). If the design speed is 25 mph and ? = 0.10, what should be the super-elevation? What is the SSD?The curve has a lane width of 14 ft. If a fence is located at 44 ft from the center of the inner lane of the curve. Calculate the available sight distance of the driver. Is the sight distance adequate? Explain your answerarrow_forwardAA vertical summit curve have grades of +4%and -3%which intersects a station 20+040. If the stopping sight distance is equal to 165.78m. A. Compute the macimum speed that a vehicle could move along this curve to avoid collision if the perception reaction time of the driver of the driver id 2.0 seconds and the coefficient od friction is equal to 0.25 B. Compute the length of the curve.arrow_forwardQ9. 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 is the maximum safe speed on this curve (based on available SSD)? Q10. A horizontal curve was designed for a four-lane highway for adequate SSD, based on a design speed of 90 km/h. Lane widths are 3.6 m, and the superelevation is 6% and was set assuming maximum fs. If the necessary sight distance required 16 m of lateral clearance from the roadway centerline, find the minimum curve radius suitable for the design conditions?arrow_forward
- Downvote for wrong answers A section of a roadway has a horizontal curve with superelevation of 6% and central angle of 40°. The design speed of the section is 60 mph. There are two lanes on the curve, each 12 f wide. Determine: (a) The degree of the curve. (b) The length of the curve. (c) The minimum distance of an obstruction from the centerline of the innermost lane.arrow_forwardQ1) Answer the following A) A section of a two-lane highway (12-ft lanes) is designed for 75 mi/h. At one point a vertical curve connects a -2.5% and +1.5% grade. The vertical curve ends at station 36 + 50. It is known that a horizontal curve starts 294 ft before the starting of the vertical curve. If the superelevation of the horizontal curve is 8% and the central angle is 38 degrees, what is the station of the beginning of the horizontal curve?arrow_forwardA horizontal curve has a radius of 750 ft, measured to the centerline of the highway. The highway has two lanes in each direction. The lane width is 12.0 ft. A billboard blocking driver's sight is located at 14.0 ft from the edge of the right lane. Calculate the available sight distance (to the nearest ft).arrow_forward
- A circular curve connects two tangents that intersect at an angle of 48°. The point of intersection of the tangents is located at station 28+900. If the design speed of the highway is 90 km/h, determine both the point of the tangent and the deflection angles to whole stations for laying out the curve. (Select appropriate values for e and f.arrow_forwardA horizontal curve is being designed through mountainous terrain for a four-lane road with lanes that are 12 ft wide. The central angle (Δ) is known to be = 24o30’ 15”, the tangent distance is 600 ft, and the stationing of the tangent intersection (PI) is 700+00. 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 0.06 ft/ft. What is the stationing of PC and PT and what is the safe vehicle speed?arrow_forwardA horizontal curve on a two-lane highway is designed with a 610-m radius, 3.5-m lanes, and 80 kph design speed. Determine the distance that must be cleared from the inside edge of the inner lane to provide sufficient stopping sight distance. (Note: Curve radius is typically reckoned from the centerline of the roadway, and driver location is assumed to be at the middle of the travelled lane.) Assume coefficient of friction as 0.35 and reaction time as 2.5s. FINAL ANSWER should be exactly 4marrow_forward
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