only do question 4 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)?

Following factors affect the stopping sight distance 1. Speed of vehicle 2. break reaction time. 3.…

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Civil Engineering

4. What is AASHTO's recommended deceleration rate (ft/s)?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter15: Geometric Design Of Highway Facilities

Section: Chapter Questions

Problem 19P

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Question

only do question 4

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)?

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