nly answer question 6
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- An old equal-tangent crest vertical curve was designed with a PVI at station 117+45 and elevation of 960 ft., and a PVC at station 110 + 85 and elevation of 927 ft. If the highest point on the curve is at station 117 + 65, what is the maximum safe design speed for this curve? (explore and report your answer in 5 mph increment) [hint: Use design tables. But this time, find the speed based on K]You are asked to design a horizontal curve for a four-lane road. The road has 12-ft lanes. Due to expensive excavation, it is determined that a maximum of 42 ft can be cleared from the road’s centerline toward the inside lane to provide for stopping sight distance. Also, local guidelines dictate a maximum superelevation of 0.08 ft/ft. What is the highest possible design speed for this curve?A Sag Vertical Curve is to be designed to join a -3% grade and a +1.5% grade. If the design speed is 65kmph. Using the AASHTO 2011 Standard, determine the following: a. Stopping Sight Distance Uphill? b. Stopping Sight Distance downhill? c. Based on the stopping sight distance (whichever is greater of A and B), compute the minimum length of curve? d.What is the minimum length of curve for driver 's comport criterion? e. What is the minimum length of curve for general appearance criterion? f. What would be the designed Minimum Length of Curve?
- A spiral easement curve has a length of 100m with a central curve having a radius of 310 m. The width of the road is 10m and design speed is 81 kph? a) What is the throw? (in meters) b) What is the spiral angle at the endpoints? (degrees) c) What is the spiral deflection angle at the endpoints? (in degrees) d) What is the superelevation at the central curve? (in meters) e) What is the offset distance from the tangent to the 3rd-quarter point of the spiral? (in meters)A sag vertical curve is to be designed to join a -4% grade to a +2% grade. If the design speed is 45 mi/h, determine the minimum length of the curve that will satisfy all criteria. Assume a = 11.2 ft/sec2 and perception-reaction time t = 2.5 sec. Use g = 32.2 ft/sec2Calculate the stopping sight distance over the crest of a 450-m vertical curve with a plus grade of 5.6 percent and a minus grade of 3.2 percent.
- Design a vertical summit parabolic curve connecting two tangent grades, a 5% grade intersecting a -3.4% grade at station 1 + 990 with an elevation 42.30 meters. The parabolic curve shall conform with the following safe stopping sight distance requirements. Design velocity = 60 kph Height of driver’s eye from the road pavement = 1.37 meters Height of an object over the pavement ahead = 100 mm. Perception/reaction time = 0.75 second Coefficient of friction between the road pavement and the tires = 0.15 Determine the following: Stopping sight distance The length of the curve The elevation of the highest point on curve.1. A parabolic curve has an ascending grade of 4% which meets a descending grade of 3% at sta. 1+ 180 whose elevation is at 320 m. Compute the elevation of the PVT(point of vertical tangency) if the length of the curve is 280 m 2. The driver of a car traveling at 65 mph saw an obstruction ahead. If the reaction distance is 72.2 m, compute the reaction time.A spiral easement curve has a length of 100m with a central curve having a radius of 360 m. The width of the road is 10m and design speed is 86 kph? a) what is the superelevation at the central curve? in meters b) what is the offset distance from the tangent to the second-quarter point of the spiral? in meters NEED ASAAAP
- The data given for a vertical sag curve on a roadway plan and profile sheet are as follows: PVI station @ 32+11.61, PVI elevation =54.18 ft, back tangent gradient g1 =- 4.00 percent, forward tangent gradient g2 = + 7.00 percent, and length of curve L= 600ft. Determine the curve elevations at half-station intervals along the curve, and compute the station and elevation of the lowest point.An easement spiral curve has a design speed of 110 Kph. The radius of the central curve is 365 m with a permissible super elevation of 0.06. Determine the Following: a. Centrifugal acceleration so as not to cause discomfort to the driver in m/sec3. b. Length of the transition curve to limit the centrifugal acceleration. c. Length of the short tangent of the transition curve.An existing vertical curve on a highway joins a +4.4% grade with a -4.4% grade. If the length of the curve is 82m, what is the maximum safe speed on this curve? What speed should be posted if 8kph increments are used?