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Vägytans inverkan på trafiksäkerheten: data från 1992-1998
Swedish National Road and Transport Research Institute.
Swedish National Road and Transport Research Institute.
Swedish National Road and Transport Research Institute.
2002 (Swedish)Report (Other (popular science, discussion, etc.))
Abstract [sv]

The main objective of this study has been to provide the Swedish National

Road Administration's (SNRA) pavement management system (PMS) with new models

describing the relation between traffic safety and road surface condition. In

the accident cost model used today, the only road surface parameter is rut

depth and only ruts deeper than 10 mm are considered to have any influence on

traffic safety. The relation is then linear and accident cost increases with

increasing rut depth. The investigation carried out is based on data from the

road surface measurements made by SNRA on state roads between 1992 and 1998

and accidents reported by the police during the same period. Precipitation

data has also been used. Regression analyses have mainly been used. The

dependent Y-variable was accident ratio (accidents/100 million axle pair

kilometres). Independent X-variables were rut depth (mm) and/or unevenness

expressed as International Roughness Index (IRI in mm/m). The material has

been divided into several different classes, such as traffic flow and

precipitation classes. Using linear regression with rut depth as the only

independent variable, it was found that the accident ratio is independent of

rut depth. Divided into summer and winter periods, there is a tendency that

the accident ratio decreases during summer and increases during winter with

increasing rut depth. With linear regression with IRI as the only independent

variable, it is found that the accident ratio increases with increasing

unevenness for most divisions of data. This also applies when only accidents

with personal injuries and fatal accidents are studied. By multiple linear

regression with rut depth and IRI as independent variables, it was found that

the accident ratio decreases with increasing rut depth and increases with

increasing unevenness for most divisions of the material. Even though the

data from the whole state road network is included in the analyses, 95% of

the material represents roads with a rut depth less than 15.4 mm and an IRI

value less than 5.1 m/m. The consequence is that the estimated linear

relations are valid only for roads of such a good standard. A variance

analysis that has been carried out does not, however, support the theory that

the accident risk on the roads with the deepest ruts should differ

dramatically from that on the roads with shallower ruts. The analysis does,

though, show that the higher the IRI value the higher the accident risk.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 909 , 2002.
Series
VTI meddelande, ISSN 0347-6049
Keyword [en]
Swedish, Sweden, Surface texture, Pavement, Rutting, Accident rate, Depth, Evenness, Regression analysis, Linear, Rain, Weather
Research subject
Road: Traffic safety and accidents, Road: Accidents; Road: Highway design, Road: Surfacing
Identifiers
URN: urn:nbn:se:vti:diva-4899OAI: oai:DiVA.org:vti-4899DiVA: diva2:673728
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03

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CiteExportLink to record
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