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 -3.5% and +3%. Design
speed is 60 mi/h. State assumptions used. Consider the following criteria: stopping sight
distance, comfort, and general appearance.
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
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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- Determine the minimum length of a vertical curve in a residential street if the grades are –4% and +3%. A design speed of 10 km/h higher than the posted speed limit has been adopted for this road. Consider the most common and desirable assumptions for road design in Australia. Assume stopping sight distance for this road is higher than the length of the vertical curve. Consider passenger car to obtain the height of eye of driver and object height (car tail light). Select one: a. None b. 35 c. 64 d. 81arrow_forwardCalculate the minimum radius of horizontal curve if the minimum design speed is 80 kph, and the super elevation provided is 0.07, with skid resistance equal to 0.15.arrow_forwardASAParrow_forward
- A 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_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_forward
- What is the safe stopping distance for the rural freeway section with design speed 80 miles/hour at 4% incline?arrow_forwardQUESTION 8 A vertical curve is needed to join to tangents; G₁=0% and G₂=-5%. Assuming a level grade (0%) for braking, and the AASHTO recommended values for deceleration and perception-reaction time, calculate the minimum length of curve (ft) needed to satisfy the safety criteria. The design speed is 70 mph.arrow_forwardAn equal-tangent sag vertical curve connects a -2.30% initial grade and a +2.30% final grade. The design speed is 50 mi/h and the elevation of the PVT is 802.3 ft. A storm drain is to be installed at the low point of the curve. What is the elevation of the low point? You answer must be in ft and rounded to the second digit, if you need to use values from tables, use "design" values (usually last column), not "calculated".arrow_forward
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