At highway stretches where the required overtaking sight distance cannot be provided, it is necessary to incorporate

at least twice the stopping sight distance

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half the required overtaking sight distance

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one third the required overtaking sight distance

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three times the stopping sight distance

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Solution

The correct option is A at least twice the stopping sight distance
When overtaking sight distance can not be provided, intermediate sight distance (ISD) is provided. ISD is twice the stopping sight distance.
Hence, option (a) is correct.

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At highway stretches where the required overtaking sight distance cannot be provided, it is necessary to incorporate

The correct option is A at least twice the stopping sight distanceWhen overtaking sight distance can not be provided, intermediate sight distance (ISD) is provided. ISD is twice the stopping sight distance. Hence, option (a) is correct.

The correct option is A at least twice the stopping sight distance
When overtaking sight distance can not be provided, intermediate sight distance (ISD) is provided. ISD is twice the stopping sight distance.
Hence, option (a) is correct.