Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Bedömd vägojämnhet på vägar med låga IRI-värden
Swedish National Road and Transport Research Institute.
2002 (Swedish)Report (Other academic)Alternative title
Estimations of road roughness on roads with low IRI-values (English)
Abstract [sv]

I denna undersökning, som är en relativt fristående del i ett projekt rörande metoder och noggrannhet vid mätning av vägars longitudinella jämnhet, studerades upplevelsen av vägojämnheter på vägar med låga IRI-värden. Med utgångspunkt från tillgängliga data studerades även effekten av slumpmässiga mätfel i IRI-mätningarna på det beräknade sambandet med upplevd ojämnhet. Undersökningen genomfördes som ett skattningsförsök där ett 20-tal bedömare fick åka med som passagerare i dels personbil, dels lastbil.

De viktigare resultaten av undersökningen var följande:

- Den upplevda ojämnheten verkar vara en linjär funktion av IRI-värdena inom det studerade ojämnhetsintervallet.

- Känsligheten hos bedömarna, eller deras överensstämmelse sins emellan, verkar vara större i personbil än i lastbil.

- För helt jämna vägar (IRI≈0) verkar det i lastbil som om väggenererade vibrationer inte längre är huvudorsaken till ojämnhetsupplevelsen.

- För några delsträckor med “icke-typisk” frekvenssammansättning av ojämnheterna visade sig IRI korrelera ganska dåligt med den upplevda ojämnheten.

- Många enskilda bedömare hade ännu starkare samband mellan sina subjektiva bedömningar och vägprofilbeskrivning i RMS-värden än mellan bedömningar och ojämnhet enligt IRI.

- Simuleringarna av slumpmässiga mätfel i IRI-värdena visade att inom det studerade intervallet, och med det relativt stora antalet värden (45), så kan slumpfel åtminstone inom +/- 0,2 IRI-enheter betraktas som betydelselösa.

Abstract [en]

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 considerably.

- 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.
Series
VTI rapport, ISSN 0347-6030
Keyword [en]
Swedish, Sweden, Surfacing, Evenness, Comfort, Measurement, Driver, Attitude, Test, In situ, Car, Lorry
Research subject
30 Road: Highway design, 33 Road: Surfacing
Identifiers
URN: urn:nbn:se:vti:diva-6344OAI: oai:DiVA.org:vti-6344DiVA: diva2:675220
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2017-02-20Bibliographically approved

Open Access in DiVA

fulltext(298 kB)100 downloads
File information
File name FULLTEXT01.pdfFile size 298 kBChecksum SHA-512
814824dc869bae87ebec6f79009d83699b74f7e8398843acb96e2a9cb4b6bb78b6d778eff1e5e9e54c6e3206096a281c006da3114f9a8a80031a411b0ad5a6de
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Dahlstedt, Sven
By organisation
Swedish National Road and Transport Research Institute

Search outside of DiVA

GoogleGoogle Scholar
Total: 100 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 38 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf