You are designing a vertical sag curve joining a -3% grade to a +2% grade. The design speed is 60 mph. For the design of the curve, the stopping sight distance is based on a 0% grade. 1. Is the shape of the vertical curve circular, elliptic, or parabolic? 2. What is the value of A? 3. What is AASHTO's recommended perception reaction time (s)? 4. What is AASHTO's recommended deceleration rate (ft/s²)? 5. What is the assumed height (ft) of the driver's eye for passenger cars? 6. What is the assumed height (ft) of the object? 7. Assuming a 0% grade, and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the brake reaction distance (ft)? 8. Assuming a 0% grade, and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the braking distance (ft)?

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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You are designing a vertical sag curve joining a -3% grade to a +2% grade. The design speed is 60 mph.
For the design of the curve, the stopping sight distance is based on a 0% grade.
1. Is the shape of the vertical curve circular, elliptic, or parabolic?
2. What is the value of A?
3. What is AASHTO's recommended perception reaction time (s)?
4. What is AASHTO's recommended deceleration rate (ft/s²)?
5. What is the assumed height (ft) of the driver's eye for passenger cars?
6. What is the assumed height (ft) of the object?
7. Assuming a 0% grade, and AASHTO's recommended perception reaction time and recommended
deceleration rate, what is the brake reaction distance (ft)?
8. Assuming a 0% grade, and AASHTO's recommended perception reaction time and recommended
deceleration rate, what is the braking distance (ft)?
Transcribed Image Text:You are designing a vertical sag curve joining a -3% grade to a +2% grade. The design speed is 60 mph. For the design of the curve, the stopping sight distance is based on a 0% grade. 1. Is the shape of the vertical curve circular, elliptic, or parabolic? 2. What is the value of A? 3. What is AASHTO's recommended perception reaction time (s)? 4. What is AASHTO's recommended deceleration rate (ft/s²)? 5. What is the assumed height (ft) of the driver's eye for passenger cars? 6. What is the assumed height (ft) of the object? 7. Assuming a 0% grade, and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the brake reaction distance (ft)? 8. Assuming a 0% grade, and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the braking distance (ft)?
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