Measurement of tyre width and assembly type (single or double tyre)


Data provided by VTI vehicle position surveys is only relevant to the right hand side of a vehicles front wheels. No tyre width or type information is available. As parameters such as wheel paths (centre point of a single or double tyre) are considered important, it was decided to test a new system that could also record tyre width and type. However, measured tyre widths were narrower than expected. Initial thoughts are that this reduction is related to the shape of the tyre footprint. This means that results were not sufficiently accurate enough to distinguish between different sizes of tyres. Although exact tyre widths could not be determined, it was still possible to determine if tyre types were either single or double. In reality, there are large differences between single tyre widths and double tyre total widths. As similar large differences existed in the survey data, distinguishing between single and double tyre configurations was relatively easy. Approximately 30,650 vehicles were recorded and around 2,900 of these (9.5%) were classified as large goods vehicles (LGVs). Forty different types of vehicle were recorded. The percentage split between single and double tyre types was around 64% single and 36% double.



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.