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3. What is AASHTO's recommended perception reaction time (s)?

3. What is AASHTO's recommended perception reaction time (s)?

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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**Vertical Sag Curve Design** When designing a vertical sag curve that connects a -3% grade to a +2% grade with a design speed of 60 mph, certain considerations need to be taken into account. The stopping sight distance is designed based on a 0% grade. Below are some questions crucial for this design process: 1. **Shape of the Vertical Curve:** - Is the shape of the vertical curve circular, elliptic, or parabolic? 2. **Value of A:** - What is the value of A? 3. **AASHTO's Recommended Perception Reaction Time:** - What is AASHTO's recommended perception reaction time in seconds? This information is vital for ensuring the safe and efficient design of vertical curves in roadways. Understanding the shape of the curve can impact how vehicles handle the transition between different grades, and knowing the perception reaction time is important for calculating stopping distances. **Note:** There are no graphs or diagrams accompanying this text.
Transcribed Image Text:**Vertical Sag Curve Design** When designing a vertical sag curve that connects a -3% grade to a +2% grade with a design speed of 60 mph, certain considerations need to be taken into account. The stopping sight distance is designed based on a 0% grade. Below are some questions crucial for this design process: 1. **Shape of the Vertical Curve:** - Is the shape of the vertical curve circular, elliptic, or parabolic? 2. **Value of A:** - What is the value of A? 3. **AASHTO's Recommended Perception Reaction Time:** - What is AASHTO's recommended perception reaction time in seconds? This information is vital for ensuring the safe and efficient design of vertical curves in roadways. Understanding the shape of the curve can impact how vehicles handle the transition between different grades, and knowing the perception reaction time is important for calculating stopping distances. **Note:** There are no graphs or diagrams accompanying this text.
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Step 1 AASHTO Recommendation

Reference : AASHTO, American Association of State Highway and Transportation

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