Olycksrisk vid lokala ojämnheter och andra ytdefekter


This study has examined, in particular, the effect road surface “local unevenness” has on traffic accident risk. Effects from other road surface defects were also considered but to a lesser extent. Test results are non-significant when considering if local unevenness has any main effect. Local unevenness has also not been chosen as part of any significant term of higher order. The analysis provides no support that local unevenness influences the risk of accidents. With regards to other variables related to the road or road surface, there is a negative correlation between rut depth and accident risk, and a positive correlation between longitudinal gradient and accident risk. Accident risk varies in correlation with IRI (International roughness index) and the permitted speed limit in a way that implies that risk decreases with higher speed and low IRI, and higher IRI and low speed. The risk increases when both IRI and speed increase. Precipitation information is an example of a variable that has been included in the analysis but is not related to the road or road surface. Data indicates that accident risk is lower in places where heavy rainfall often occurs.



Cost Benefit Analysis (CBA) workshop in Stockholm

An open seminar and workshop in Stockholm will be held on 25-26 April 2018. The workshop deals with the use of CBA as a basis for decision-making in the public sector. The workshop is organized by, among others, Professor Jan-Eric Nilsson, VTI.



Modal shift for an environmental lift?

Investigations in Sweden and other countries suggest a shift of goods transport from road to rail and waterborne transport to reach environmental and climate objectives. VTI is leading a new project to investigate how the modal shift can contribute and what...


Automation and digitalisation are making rail competitive

Road transport is developing rapidly and its productivity has increased sharply. Rail transport, however, has not developed at the same rate. Automation and digitalisation are essential if rail freight in Europe is to survive.


New research is creating a driverless logistics chain

The research project Born to Drive has come up with a system that allows new cars to move, without a driver, from the production line out to the parking area prior to being transported elsewhere. The vision is to automate the entire logistics chain from...


VTI testing automation in EU project

VTI is leading a series of tests in a major EU project on automated driving. The first driving tests were carried out n a test track in Slovenia in December. The project will focus in part on acceptance among different groups in society, in part on...


Freight transportation on road and rail analysed

Freight transport accounts for a large proportion of the emissions, noise and congestion produced by road traffic. Transporting freight in larger but fewer lorries could reduce the problem. At the same time it might entail freight being diverted from more...


Millions for research into maritime transport and the environment

Maritime transport is a major source of emissions of harmful air pollutants and carbon dioxide. In a new project, a research team from the Swedish National Road and Transport Research Institute (VTI) and the University of Gothenburg has received SEK 6.4...