Träds inverkan på belysningseffekt på gång- och cykelvägar

Annika Jägerbrand

Trees and vegetation in the street environment are important components of urban areas and they increase the environmental quality in cities. The purpose of this study was to examine the influence of trees on shade effects (illuminance and spectral distribution) in pedestrian and bicycle paths by quantifying the reduction of streetlight caused by tree intrusion in order to give recommendations for the management and maintenance of trees in the street environment. Measurements of the shading were tree intrusion and tree area as well as changes in R/FR. R/FR is a measurement on how shade from vegetation affects the spectral distribution. The results show that any type of intruding vegetation into the sidewalk area has a potential blocking effect on the illuminance and that the effect increased the more the trees are infringing. Tree shadow caused the illuminance to drop between 27-77%. Current guidelines for free height above pedestrian zones, bicycle roads and driving lanes are consequently not high enough to prevent shade effects by trees. The free height of vegetation and trees should be as high as the lighting pole in order to avoid light reductions due to tree intrusion.



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.