Speed distribution and traffic safety measures


A main  traffic  safety  priority in  many  countries  is  implementing measures  that reduce  road  user  speed  and increase  speed limit compliance. This study compares changes in the  speed distribution  and estimated accident risk brought about by three measures:

  1. speed limit change from 110 to 100 km/h on roads without speed cameras
  2. speed  limit  change  from  90  to  80  km/h  on  roads  with  speed  cameras
  3. introducing new  speed  cameras  on roads  with a  speed  limit  of 90  km/h

The  accident  risk  is  estimated  from  mean  speed  since  the  impacts of  a change in mean speed on the number of accidents and of injured and killed people are well known. The results indicate that installing speed  cameras  can  reduce  average  speed  more  than can reducing the  speed  limit  by  10 km/h, at least at the camera locations. Moreover, speed cameras reduce the standard deviation of speed and the percentage of drivers exceeding the speed limit by far more than does lowering the mean speed. This implies that the  relationship  between  change  in  speed  distribution,  not  only  mean  speed,  and  traffic  safety merits further investigation.



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

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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.