According to the Indian Road Congress(IRC73-1980), in the calculation of Overtaking Sight Distance (OSD), the reaction time 't' of the driver is assumed to be:
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A.
1 second
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B.
3 seconds
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C.
5 seconds
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D.
2 seconds
Correct Answer:
D. 2 seconds
Explanation:
The correct answer is 2 seconds.
According to the Indian Road Congress (IRC 73-1980), the driver's reaction time (t) used for calculating Overtaking Sight Distance (OSD) is assumed to be 2 seconds. This duration accounts for the time required for a motorist to observe the situation, decide to overtake, and initiate the maneuver. While a reaction time of 2.5 seconds is standard for Stopping Sight Distance (SSD), the IRC specifies a slightly lower value of 2 seconds for overtaking scenarios on rural highways to ensure safe geometric design.
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