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The recommended minimum traffic growth rate and design period considered for structural design of flexible pavements for national highways in India as per IRC 37:2018 is ______ percentage and ______ years, respectively.

1. 5, 20
2. 5, 30
3. 7, 20
4. 7, 30

Correct answer: 5, 20

Solution

The correct option specifies a minimum traffic growth rate of 5% and a design period of 20 years, which aligns with the guidelines set by IRC 37:2018 for ensuring the structural integrity and longevity of flexible pavements on national highways.

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