Research on the application of smartphone utility software to evaluate traffic noise and road surface iri index - 14
3 ≤ IRI < 5, however, during the measurement process, there were a few points with IRI > 5 due to the road surface having many potholes, some craters, wheel ruts, etc. 3.3.3. Preliminary survey of IRI index on other routes. Location: Hanoi – Hai Phong Expressway Prepare: The phone comes ...












