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The group index method of design of flexible pavement was suggested by __________

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in Geotechnical Engineering II by (93.7k points)
The group index method of design of flexible pavement was suggested by __________

(a) O.J. Porter

(b) California state highway

(c) Highway research board

(d) North Dakota state highway

I have been asked this question in homework.

My question comes from Flexible Pavement in section Design of Flexible & Rigid Pavement of Geotechnical Engineering II

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by (243k points)
The correct answer is (c) Highway research board

The explanation: The group index method of design of flexible pavement was suggested by Highway research board (1945). California state highway devised the California bearing ratio.

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