7. Assuming a 0% grade, and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the brake reaction distance (ft)?
7. Assuming a 0% grade, and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the brake reaction distance (ft)?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Show work and answer question 7 only
![**Designing a Vertical Sag Curve: An Analysis**
You are tasked with designing a vertical sag curve that transitions from a -3% grade to a +2% grade. The design speed for this curve is 60 mph. The stopping sight distance is calculated based on a 0% grade.
1. **Curve Shape**
- Is the shape of the vertical curve circular, elliptic, or parabolic?
2. **Parameter A**
- What is the value of A?
3. **Reaction Time**
- What is AASHTO’s recommended perception reaction time in seconds?
4. **Deceleration Rate**
- What is AASHTO’s recommended deceleration rate in feet per second squared (ft/s²)?
5. **Driver’s Eye Height**
- What is the assumed height of the driver’s eye for passenger cars in feet?
6. **Object Height**
- What is the assumed height of the object in feet?
7. **Brake Reaction Distance**
- Assuming a 0% grade and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the brake reaction distance in feet?
8. **Braking Distance**
- Assuming a 0% grade and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the braking distance in feet?
This set of questions will guide the design considerations for a safe and efficient vertical sag curve on roadways.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fddec1f96-2c6f-432b-927a-25d2e3406f6d%2Ffbf7bf50-f9f5-4314-93d6-e5f2bba48fcd%2Fp4poj6p_processed.png&w=3840&q=75)
Transcribed Image Text:**Designing a Vertical Sag Curve: An Analysis**
You are tasked with designing a vertical sag curve that transitions from a -3% grade to a +2% grade. The design speed for this curve is 60 mph. The stopping sight distance is calculated based on a 0% grade.
1. **Curve Shape**
- Is the shape of the vertical curve circular, elliptic, or parabolic?
2. **Parameter A**
- What is the value of A?
3. **Reaction Time**
- What is AASHTO’s recommended perception reaction time in seconds?
4. **Deceleration Rate**
- What is AASHTO’s recommended deceleration rate in feet per second squared (ft/s²)?
5. **Driver’s Eye Height**
- What is the assumed height of the driver’s eye for passenger cars in feet?
6. **Object Height**
- What is the assumed height of the object in feet?
7. **Brake Reaction Distance**
- Assuming a 0% grade and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the brake reaction distance in feet?
8. **Braking Distance**
- Assuming a 0% grade and AASHTO's recommended perception reaction time and recommended deceleration rate, what is the braking distance in feet?
This set of questions will guide the design considerations for a safe and efficient vertical sag curve on roadways.
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