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Vägytans inverkan på körkomforten: bilisters monetära värdering av komfort
Swedish National Road and Transport Research Institute.
Swedish National Road and Transport Research Institute.
Swedish National Road and Transport Research Institute.
2004 (Swedish)Report (Other academic)Alternative title
The influence of road surface condition on driving comfort (English)
Abstract [sv]

The decision support system for the maintenance of paved roads, PMS, of the

Swedish National Road Administration comprises a number of models for

estimating the costs of road management authorities, road users and society

at large. In 1998 VTI was commissioned by the Road Administration to carry

out a comprehensive project with the objective of revising and augmenting

these traffic effect models. The project is entitled "Traffic effects of the

road surface" and has comprised a number of subprojects. The primary aim of

this study has been to investigate, in a field study, the relationship

between the roughness of the road surface (expressed in terms of the

International Roughness Index IRI, with the units mm/m) and the perceived

driving comfort of motorists, as well as their willingness to pay for

improved driving comfort. 50 test subjects were asked to drive a car over

nine 500 m long sections with different surface standards. The mean of the

measured IRI on these road sections varies from 0.8 mm/m on the smoothest

section to 10.5 mm/m on the roughest. In conjunction with the investigation,

the test subjects were interviewed by a test leader. During the interview,

they were asked which factors are significant for driving comfort and how

they perceived driving comfort on the different sections. The state/condition

of the asphalt surfacing was considered to have the greatest significance,

followed by the car and the behaviour of other road users. Density of traffic

was considered to have the least significance. The test subjects were also

asked to say what significance different defects in the surfacing had on

driving comfort. What is most important for a comfortable car journey is that

there are no holes/depressions in the surfacing. This is followed by ruts,

roughness that causes vibrations, and bumps and subsidence. The test subjects

were asked to make a general assessment of driving comfort on a five-degree

scale during their drive over the nine sections. A clear relationship was

found between the assessment that the test subjects made and the measured

IRI, i.e. the higher the IRI, the worse driving comfort was judged to be.

The physical impact caused by the different surface standards of the test

sections was also investigated by placing a dummy equipped with triaxial

accelerometers in the passenger seat of the car that drove over the test

sections. The willingness of the test subjects to pay for improved comfort

associated with the condition of the road surface was also investigated by

three methods: Stated Preference (Choice) and Contingent Valuation Method

(driving comfort versus petrol price and trip time). A relatively high

willingness to pay was obtained, but the methods gave very different results.

It has therefore been impossible to posit a comfort cost model on the basis

of these. This requires further studies and development of the methods.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 957 , 2004.
VTI meddelande, ISSN 0347-6049
Keyword [en]
Swedish, Sweden, Pavement management system, Cost, Surface texture, Evenness, Comfort, Stated preference, Driver, Vibration, Anthropometric dummy
Research subject
Road: Vehicles and vehicle technology, Road: Vehicle comfort; Road: Highway design, Road: Surfacing; Road: General works, surveys, comprehensive works, Road: Economics
URN: urn:nbn:se:vti:diva-5150OAI: diva2:673980
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03

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