The sight distance available on a road to a driver at any instance depends on:
A. Features of the road ahead
B. Height of the driver's eye above the road surface
C. Height of the object above the road surface
Choose the correct answer from the options given below:
A. Features of the road ahead
B. Height of the driver's eye above the road surface
C. Height of the object above the road surface
Choose the correct answer from the options given below:
Show Hint
- A and B only
- A and C only
- B and C only
- A, B and C
The Correct Option is D
Solution and Explanation
Step 1: Analyze factor A (Road Features).
The horizontal alignment (curves), vertical alignment (summits/valleys), and obstructions like buildings or trees directly limit how far a driver can see. Thus, A is a critical factor.
Step 2: Analyze factor B (Driver's Eye Height).
The higher the eye level, the further the driver can see over a crest curve. IRC standards typically fix this at $1.2 \text{ m}$ for passenger cars. Thus, B is a critical factor.
Step 3: Analyze factor C (Object Height).
Sight distance is defined by the ability to see an object of a certain height. For SSD, the object height is $0.15 \text{ m}$, whereas for OSD, it is $1.2 \text{ m}$. If the object is taller, it becomes visible sooner. Thus, C is a critical factor.
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