An existing vertical curve on a highway joins a +4 percent grade. Assume f=0.4 and perception-reaction time of 2.5 sec, and S< L. If the length of the curve is 225 ft, the maximum safe speed of the curve(mi/hr). What would you recommend as the speed limit for this vertical curve?
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An existing vertical curve on a highway joins a +4 percent grade. Assume f=0.4 and perception-reaction time of 2.5 sec, and S< L. If the length of the curve is 225 ft, the maximum safe speed of the curve(mi/hr). What would you recommend as the speed limit for this vertical curve?
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The two tangents intersect at station (35+70). 1- Find the tangent and curve lengths for a 5° curve 2- Recommended a superelevation rate if the design speed is 100 km/hr and the coefficient of side friction is 0.12. 3- What is the clearance distance required for an obstruction near the road if the acceleration rate is 4 m/sec? ?An existing vertical curve on a highway joins a +3.0% grade with a -3.0% grade. If the length of the curve is 250 ft, what is the maximum safe speed on this curve? What speed should be posted if 5 mph increments are used? Assume a = 11.2 ft/sec2, perception-reaction time t = 2.5 sec, and that S>L. Use g = 32.2 ft/sec2Plz, solve this problem. Transportation Engineering-2 A four-lane highway (2 lanes in each direction) with 3.65m lanes has a horizontal curve designed for a 380 m centerline radius, and a 110 km/hr design speed. The grade is level. Use a driver perception reaction time of 2.5 sec and a vehicle deceleration rate of 3.4 m/sec2. Determine the closest distance any roadside object may be placed to the centerline of the inside lane of the roadway.(note: Do not round any value. Use calculated values).What do you understand by "adequate visibility" and "passenger comfort and safety" as applied in vertical curve. How are such factors taken off in road design?The 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 = 0.15SEE MORE QUESTIONS