Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 15, Problem 6P
To determine
The minimum length of sag vertical curve and the assumptions used by using the criteria stopping sight distance, comfort and general appearance.
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Determine the minimum length of a sag vertical curve if the grades are 4% and 2%. Design speed is 70 mi/h. State assumptions used. Consider the following criteria: (a) Stopping sight distance (b) Comfort (c) General appearance
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speed is 60 mi/h. State assumptions used. Consider the following criteria: stopping sight
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Determine the minimum length of a sag vertical curve if the grades are -4% and +2%. The design speed is 70 mph. Assume the driver's reaction time is 2.5 seconds and the deceleration rate is 11.2 ft/s². Use the standard headlight criteria and riding comfort criteria from the FE SSD equations and select the largest curve length that meets the assumptions.
Chapter 15 Solutions
Traffic and Highway Engineering
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- Traffic Engineering vertical curve problem. Solve the d,e,f partarrow_forwardA 8-degree simple curve is to be designed for a maximum speed of 91.8kph. The coefficient of friction between the tires and pavement is 0.32. What is the required super elevation in percent?arrow_forwardTwo 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…arrow_forward
- find the best curve dimensions to reach a safe speed of 110km/hr.arrow_forwardA 1400-ft-long sag vertical curve (equal tangent) has a PVC at station 115 + 00 and elevation 750 ft. The initial grade is -3.5% and the final grade is +6.5%. Determine the elevation and stationing of the low point, PVI, and PVT.arrow_forwardWhat is the safe stopping distance for the rural freeway section with design speed 80 miles/hour at 4% incline?arrow_forward
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