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 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.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter15: Geometric Design Of Highway Facilities

Section: Chapter Questions

Problem 21P

See similar textbooks

Similar questions

The ascending of a vertical curve is 1/45 and descending gradient is 1/55. If the design speed is 60 km/hr and rate of change of acceleration of 0.4 m/s3, calculate the minimum length of the curve.
A vertical alignment for a single carriageway road consists of a parabolic crest curve connecting a straight-line uphill gradient of +4% with a straightline downhill gradient of -3%. Determine the following: (1) Calculate the vertical offset at the point of intersection of the two tangents at PI (2) Calculate the vertical and horizontal offsets for the highest point on the curve.Assume a design speed of 85km/hr and use the absolute minimum K value for crest curves. Show the complete solution asap.
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.
Problem # 3 A spiral easement curve has a length of 80m and the radius of the central curve is 200m. Determine the max. the velocity that a car could pass thru the spiral curve.
Two vertical parabolic curves have been connected to form a roadway by three gradients: -5.30 %, 4.10 % and -3.70 % respectively. If the length of the second curve is twice as the length of the first curve, compute the following: a. The length of the second curve in ft given that the design speed of the first curve is 80 kph assuming a vertical radial acceleration of 0.3m/s2 for comfort criterion. b. The length of the second curve in m if the headlight height of the vehicle is 0.73 m above the first curve and the inclined upward angle of the headlight beam relative to the horizontal plane of the vehicle is 1.57% The design speed for the first curve for this situation is 90 kph. c. The length of the first curve in yard if the total length of the roadway is 7451 m given that the second curve has a design speed of 70 kph for passing sight distance with the driver's eye height assumed to be 1.5 m and object height of 0.33 m. d.The total length of the roadway in km if a bridge…
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
The allowable side friction factor for horizontal curves with a design speed of 100 km/h is 0.12. (a) What superelevation rate would you use for a curve with a design speed of 100 km/h and a radius of 420 m? Round to the nearest whole percent. (b) A spiral transition curve is used to go from a normal crown slope with 2% cross-slopes to full superelevation for the curve described above. If the maximum difference in grade between the centerline and the edge is 1:200 and the roadway consists of two 3.6 m lanes, what is the minimum length of spiral? Round up to the next integral multiple of 20 m. (c) The station of the TS is 501+00. Draw the superelevation diagram.
A 200-m symmetrical parabolic curve is to be placed between grades of g1=1.25% and g2=-2.75% intersecting at station 18+000, which has an elevation of 270.190m above mean sea level. a)Calculate elevations for every 20-m station on the vertical curve b)Determine the station and elevation of the highest point on the curve. c)Determine the rate of change of the vertical curve.
An equal-tangent crest vertical curve is designed with a PVI at station 110 + 00 (elevation 927.2 ft) and a PVC at station 107 + 43.3 (elevation 921.55 ft). If the high point is at station 110 + 75.5, what is the design speed of the curve?
An unsymmetrical parabolic curve has a forward tangent of 10% and a back tangent of +6%. the length of the curve on the left side (P.C) is 60m. If the vertex is at elevation of 100 m and the rate of change in grade of the first curve is -2% per 20m length, determine the following: A. Elevation of P.C. B. Elevation of P.T. C. Length of the Second Curve
A horizontal curve has a maximum speed of 50 mph. If e = 0.10, and f = 0.16, find the degree of the curve. a. 4.84 deg b. 5.84 deg c. 3.84 deg d. 6.24 deg
A 500-m long equal tangent vertical curve has a point of vertical curvature at station 2 + 600 and elevation 450 m. The initial grade is -5% c) determine the desing speed for this vertical curve( in 10 km/h increments )