Could adherence and road geometry be used to identify the areas of risk?

Michel Gothie

Although road traffic accidents rarely have a single cause, if we take into account the relative amounts of time pavements are wet rather than dry, twice the proportion of accidents occur on wet pavements. This paper uses a number of case studies to attempt to assess if adherence and road geometry could explain the increased risk during wet weather. In recent years, the link between pavement surface characteristics and accident risk on wet pavements has been demonstrated by a number of authors from different parts of the world. The analysis conducted in the studies described in this paper confirms this link, without claiming to measure in absolute terms the effect on road safety of the factor considered (friction, texture or layout). Nevertheless, comparisons between case studies on routes with very different layouts and driving conditions show that: 1) friction and texture characteristics have the same type of effects on the accident rate on wet pavement, namely - a) the accident rate tends to increase when the sideway force coefficient or the macrotexture diminishes, b) the change in the accident rate is not steady, but becomes much less below certain values; 2) the curvature radius of the bends, on difficult road layouts, is an important factor of influence on the accident rate, and on the severity of these accidents.



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.



Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018

VTI’s Senior Research Leader Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018 for his work on research into tyres and road surface.


Steps need to be taken to increase traffic safety of automated cars

Several steps are necessary to ensure that automated and connected cars will lead to increased traffic safety – everything from ensuring that technology takes vulnerable road users into account, to new forms of driver training. This has emerged in a position...


FALCON examines challenges in the transport sector

VTI is one of several important partners in the major FALCON project*, whose purpose is to create knowledge and insight regarding the transport sector. In an initial subproject, VTI has produced a manual on transport, logistics and multimodality.


VTI joined research cooperation in China

In December 2017 VTI became a member of China-Sweden Research Centre for Traffic Safety (CTS).


Swedish German research collaboration on Electric Road Systems

The project “Swedish-German research collaboration on Electric Road Systems” (CollERS) has now officially started. The goal of the project is to increase the common knowledge around Electric Road Systems by cooperation between Germany and Sweden and to...


Electric Road Systems Conference 2018

After a successful first conference in June 2017, the Swedish research and innovation platform for electric roads is arranging the second dedicated International Conference on Electric Road Systems (ERS) June 13th and 14th 2018.