Question For a portion of national highway where a descending gradient of 1 in 25 meets with an ascending gradient of 1 in 20, a valley curve needs to be designed for a vehicle travelling at 90 kmph based on the following conditions. (i) headlight sight distance equal to the stopping sight distance (SSD) of a level terrain considering length of valley curve > SSD. (ii) comfort condition with allow ablerate of change of centrifugal acceleration = 0.5 m/sec³. Assume total reaction time = 2.5 seconds; coefficient of longitudinal friction of the pavement = 0.35; height of head light of the vehicle = 0.75 m; and beam angle = 1°. What is the length of valley curve (in m) based on the comfort condition?_
Question For a portion of national highway where a descending gradient of 1 in 25 meets with an ascending gradient of 1 in 20, a valley curve needs to be designed for a vehicle travelling at 90 kmph based on the following conditions. (i) headlight sight distance equal to the stopping sight distance (SSD) of a level terrain considering length of valley curve > SSD. (ii) comfort condition with allow ablerate of change of centrifugal acceleration = 0.5 m/sec³. Assume total reaction time = 2.5 seconds; coefficient of longitudinal friction of the pavement = 0.35; height of head light of the vehicle = 0.75 m; and beam angle = 1°. What is the length of valley curve (in m) based on the comfort condition?_
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![Question
For a portion of national highway where a descending gradient of 1 in 25 meets with an ascending
gradient of 1 in 20, a valley curve needs to be designed for a vehicle travelling at 90 kmph based on
the following conditions.
(i) headlight sight distance equal to the stopping sight distance (SSD) of a level terrain considering
length of valley curve > SSD.
(ii) comfort condition with allow ablerate of change of centrifugal acceleration = 0.5 m/sec3.
Assume total reaction time = 2.5 seconds; coefficient of longitudinal friction of the pavement = 0.35;
height of head light of the vehicle = 0.75 m; and beam angle = 1°.
What is the length of valley curve (in m) based on the comfort condition?________](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F10bcc8ea-feb8-4f77-aa6d-4e1a833c73c7%2F064b68ba-5f35-4b90-8295-6ddbb4a0cc68%2Fh93j5hp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Question
For a portion of national highway where a descending gradient of 1 in 25 meets with an ascending
gradient of 1 in 20, a valley curve needs to be designed for a vehicle travelling at 90 kmph based on
the following conditions.
(i) headlight sight distance equal to the stopping sight distance (SSD) of a level terrain considering
length of valley curve > SSD.
(ii) comfort condition with allow ablerate of change of centrifugal acceleration = 0.5 m/sec3.
Assume total reaction time = 2.5 seconds; coefficient of longitudinal friction of the pavement = 0.35;
height of head light of the vehicle = 0.75 m; and beam angle = 1°.
What is the length of valley curve (in m) based on the comfort condition?________
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