International Roughness Index specifications around the world

Múčka, Peter

doi:10.1080/14680629.2016.1197144

Cited by 122 publications

(93 citation statements)

References 7 publications

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“…The Italian highway road agency requires calculating IRI on a segment of 10 m, admitting in general values lower than 1.8 m/km [38]. In the case of short span bridges and when joints are present on road pavement surface, IRI values until 2.5 m/km are tolerated [41].…”

Section: Test Results and Discussionmentioning

confidence: 99%

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Bridge Expansion Joint in Road Transition Curve: Effects Assessment on Heavy Vehicles

et al. 2017

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Properly-designed road surfaces provide a durable surface on which traffic can pass smoothly and safely. In fact, the main causes that determine the structural decay of the pavement and its parts are the traffic loads. These repeated actions can create undesirable unevennesses on the road surface, which induce vertical accelerations on vehicles, up to hindering contact between pavement and tire, with dangerous consequences on traffic safety. The dynamic actions transmitted by the vehicles depend on these irregularities: often, a bridge expansion joint (BEJ), introducing a necessary discontinuity between different materials, determines from the beginning a geometric irregularity in the running surface. Besides, some structural conditions could emphasize the problem (e.g., local cracking due to the settlement of the subgrade near the abutment or the discontinuity of stiffness due to the presence of different materials). When the BEJ is located in a transition curve, an inevitable vertical irregularity between road and joint can reach values of some centimeters, with serious consequences for the road safety. This paper deals with the analysis of a case study of a BEJ. Several test surveys were performed in order to fully characterize the effects on both vehicles and pavement. The three-dimensional representation of the pavement surface and the acceleration measurements on a heavy test vehicle were performed to analyze the joint behavior under traffic. Finally, a finite element model was implemented to evaluate the stress contribution on vehicle components induced by the vertical irregularities.

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Section: Test Results and Discussionmentioning

confidence: 99%

“…The roughness assessment of the survey road section was performed calculating the most worldwide used roughness evaluation criteria [38]: the International Roughness Index (IRI). This approach [39] is based on a mathematical model (quarter-car), whose mechanical parameters (also known as golden-car) are listed in Table 4.…”

Section: Test Results and Discussionmentioning

confidence: 99%

Bridge Expansion Joint in Road Transition Curve: Effects Assessment on Heavy Vehicles

et al. 2017

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“…IRI is an index defined by the number of disturbances, their size and layout per unit length of the road surface [22]. Scientist P. Mučka [14] is summarised IRI limit values for new, reconstructed, or rehabilitated roads and road classification schemes used around the world.…”

Section: Introductionmentioning

confidence: 99%

“…Another method used to evaluate the road roughness is the International Roughness Index (IRI) [13,14,20]. IRI is an index defined by the number of disturbances, their size and layout per unit length of the road surface [22].…”

Section: Introductionmentioning

confidence: 99%

Estimation of road roughness from data of on-vehicle mounted sensors

Surblys¹,

Žuraulis²,

Sokolovskij³

2017

EiN

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“…Furthermore, the capability of the ISO 2631 [19] approach as a road unevenness indicator was investigated, comparing the results with those obtained using the consolidated methods (RN, RQI Mich and RQI Mn ). Finally, all the aforementioned approaches were compared with IRI, which is the most-used road roughness evaluation method worldwide, as stated in [25], where IRI specifications around the world are reported. In this way, this work intends to highlight the need of standardizing mean panel tests, adopting also homogeneous speed-related threshold values to be used for ride quality evaluation.…”

Section: Introductionmentioning

confidence: 99%

Ride Quality Due to Road Surface Irregularities: Comparison of Different Methods Applied on a Set of Real Road Profiles

Loprencipe

Zoccali

2017

Coatings

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Road roughness evaluation can be carried out using different approaches. Among these, the assessment of ride quality level perceived by road users is one of the most-used. In this sense, different evaluation methods have been developed in order to link the level of irregularities present on road surface profiles with the induced detrimental effects in terms of discomfort. In particular, relationships between wavelength content of road profiles and consequent level of comfort perceived had been investigated by using, in general, a mean panel ratings approach. In this paper, four ride quality evaluation methods (Ride Number, Michigan Ride Quality Index (RQI), Minnesota Ride Quality Index and frequency-weighted vertical acceleration, a wz , according to ISO 2631 were applied to a set of real road profiles. The obtained results were analyzed, investigating a possible relation between the different indices, comparing them also with the most-used road roughness method worldwide: the International Roughness Index (IRI). The analyses carried out in this work have highlighted how the various rating scales may lead to a different ride quality assessment of the same road pavements. Furthermore, comparing the a wz with the values obtained for the other three methods, it was found that their rating scales are set for speeds within the range 80-100 km/h. For this reason, it is necessary to identify new thresholds to be applied for lower speeds, as in the case of urban roads. In this sense, the use of the ISO 2631 approach would seem to be a useful tool.

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International Roughness Index specifications around the world

Cited by 122 publications

References 7 publications

Bridge Expansion Joint in Road Transition Curve: Effects Assessment on Heavy Vehicles

Bridge Expansion Joint in Road Transition Curve: Effects Assessment on Heavy Vehicles

Estimation of road roughness from data of on-vehicle mounted sensors

Ride Quality Due to Road Surface Irregularities: Comparison of Different Methods Applied on a Set of Real Road Profiles

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