For a given road, the safe stopping sight distance (SSD) is 80 m and the passing sight distance is 300 m. What will be the intermediate sight distance?
Show Hint
- 190 m
- 220 m
- 160 m
- 150 m
The Correct Option is B
Solution and Explanation
Step 1: Formula for Intermediate Sight Distance (ISD).
The intermediate sight distance (ISD) is taken as twice the stopping sight distance (SSD).
\[
ISD = 2 \times SSD
\]
Step 2: Substitution.
Given that SSD = 80 m, we have:
\[
ISD = 2 \times 80 = 160 \, \text{m}.
\]
Step 3: Correction with respect to Passing Sight Distance.
As per IRC recommendations, ISD is the average of SSD and PSD when both are provided:
\[
ISD = \frac{SSD + PSD}{2} = \frac{80 + 300}{2} = \frac{380}{2} = 190 \, \text{m}.
\]
Step 4: Conclusion.
Hence, the intermediate sight distance is 190 m, so the correct answer is (A).
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