2+1-roads with cable barriers - safety and traffic performance results

Torsten Bergh
Arne Carlsson

The objectives of this paper are to present the Swedish National Road Administration (SNRA) development program to upgrade traffic safety on existing 13 m using low cost measures, and also to summarize all important results and findings until April 2001 from opened projects as yet, totally about 200 km. There is a significant gap in traffic performance, safety,investment and maintenance costs, land requirement and intrusion between normal two-lane and four-lane cross-sections. In Sweden this gap so far hasbeen filled with a 13 m road with 3.75 m traffic lanes and 2.75 m hard shoulders. The traffic performance of these roads is quite satisfactory but there are safety problems with fatal accidents. Almost 100 people are killed and about 400 people are severely injured every year on 13 m roads due to thehuge traffic load, still being the safest two-lane road. The main problem onall two-lane roads is run-off and meeting accidents causing more than 50% ofall fatalities. The event process tends to be the same. The driver looses control for some reason and crashes against some obstacle in the roadside area or in the shape of an opposing unlucky driver. In 1998, the directorgeneral of SNRA decided on a full-scale program to improve traffic safety on six existing 13 m roads using low-cost measures, preferably within an existing right-of-way. The main alternative is the 2+1-solution with aseparating cable barrier, preferable within the existing width 13 m. This solution was estimated to have a potential to prevent some 50% of all severe link accidents. Findings so far have been judged so successful that SNRA has decided to replace the old 13 m road with the 2+1-solution on a general basis.



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.