International Roughness Index (IRI) -

International Roughness Index (IRI) - সঠিক উত্তর কম হলে রাস্তার অবস্থা ভালো বুঝায়

International Roughness Index (IRI) এর মান সাধারণত ইঞ্চি/মাইলে পরিমাপ করা হয়। এর মান কম হলে রাস্তার অবস্থা ভালো বুঝায়।
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