Civil Engineering - GATE Exam Questions - Discussion

Discussion Forum : GATE Exam Questions - Section 1 (Q.No. 4)
On sag (or valley) curves the available sight distance is determined based on :
design speed
height of obstacle
height of driver eye
night-time driving conditions
Answer: Option
No answer description is available. Let's discuss.
34 comments Page 2 of 4.

Sachin said:   6 years ago
Yes, I too agree Option D is correct.

Chanti said:   6 years ago
In summit (hog) curves available sight sight distance is based on SSD.

In valley (sag) curves available sight distance is based on head light distance.

Venu gopal said:   6 years ago
Option D is correct I think.

Bapuji pradhan said:   6 years ago
Explain the answer.

Roy said:   6 years ago
Yes, it's D.

Ismail said:   7 years ago
The valley curve should be designed such that there is enough headlight sight distance. Improperly designed valley curves result in extreme riding discomfort as well as accident risks, especially at nights. The length of valley curve for various cases was also explained in the section. The concept of Valley curve is used in underpasses.

Naveen said:   7 years ago
It has to be Head Light Sight Distance i.e. Option D.

M.suna said:   7 years ago
Answer c should be correct. Because according to the relation L= NS2/2h+2stan (α).

Alpha should be always 1 as per IRC. So hear, if we find out "h" i.e. height of the driver then we can get SSD easily.

Duraisamy said:   7 years ago
Option D is Wrong because road alignment is considered into height of driver.

Sagar said:   7 years ago
Sight distance depends upon height of the headlight i.e. 0.75m in turn is used only in nighttime driving condition.

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