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Bedömd vägojämnhet på vägar med låga IRI-värden
Swedish National Road and Transport Research Institute.
2002 (Swedish)Report (Other academic)
Abstract [sv]

The reported investigation is one part of a project concerning methods for

measurement of the

longitudinal roughness of roads and the necessary accuracy. In this study the

main focus was on the

subjective experience of roughness on roads with low IRI-values, i.e. fairly

good roads. Using the

available roughness data it was also studied how much a random error, added

to the IRI-values,

would influence the calculated correlations with the subjective estimates.

The investigation was

carried out as a magnitude estimation experiment, in which some 20 observers

made their estimates

while travelling as passengers first in a car, and later in a lorry.

The main results of the study were as follows:

- Subjective roughness seems to be a linear function of roughness according

to IRI within the

studied roughness range.

- The reliability of the observers, and the agreement between them, seems

better in the car than in

the lorry.

- For the very smooth sections (IRI almost =0) the roughness experienced in

the lorry might have

been caused by other vibration sources than the road surface.

- For some road sections with a "non-typical" spectral composition of the

road roughness it was

found that the correlation between IRI and subjective roughness decreased


- Some observers had even stronger correlations between their subjective

ratings and road profile

expressed in RMS units than between their estimates and IRI roughness.

- The simulations of random errors added to the IRI-values showed that,

within the studied range

and with the fairly large number of observations (45), random measurement

errors up to at least ±

0,2 IRI-units can be considered insignificant.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI rapport 474 , 2002.
VTI rapport, ISSN 0347-6030
Keyword [en]
Swedish, Sweden, Surfacing, Evenness, Comfort, Measurement, Driver, Attitude, Test, In situ, Car, Lorry
Research subject
Road: Highway design, Road: Surfacing
URN: urn:nbn:se:vti:diva-6344OAI: diva2:675220
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03

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Dahlstedt, Sven
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