Heldragen kantlinje på tvåfältsväg: hastighet och synbarhet


The aim was to investigate whether travel speed on two lane roads is influenced by the type of edge line. Another aim was to investigate whether there is a difference in durability for different line types. The study was carried out on a rural road segment. In year one, the entire road segment had a continuous edge line. In year two and three, half the segment had a continuous edge line, while the other half had a broken edge line. Travel speed of free flow passenger cars was measured each year, both in daylight and at night. The function of the edge lines was measured in terms of retroreflection and luminance coefficient. The results showed that the type of edge line did not have an influence on travel speed, neither in daylight nor at night. The preview time was significantly higher for the continuous than for the broken edge line. No difference in durability between the two line types could be observed during the two years the study was carried out. From a traffic safety and comfort perspective, the results point toward the use of continuous edge lines on two lane roads, at least on hilly and curving roads.



Open seminar with Mistra SAMS international scientific advisory...

Mistra SAMS international scientific advisory panel (ISAP) is visiting Stockholm, and the program will host an open seminar where the panel members will give talks in their area of expertise.

ERPUG 2017

The five year anniversary of  European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017. 



Vehicle Driver Monitoring: sleepiness and cognitive load

To prevent road crashes it is important to understand driver related contributing factors, which have been suggested to be the critical reason in 94 per cent of crashes. The overall aim of the project Vehicle Driver Monitoring has been to advance the...


Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017. 


Crash testing bicycles at VTI

For the first time single bicycle crashes have been simulated at the VTI crash safety laboratory.


A case study exploring firefighters’ and municipal officials’ preparedness for electrical vehicles

A VTI-study presents a social perspective on new vehicle technology. It explores the self-reported preparedness of the fire departments (i.e., rescue services) in Sweden’s three largest cities regarding rescue operations involving electrical vehicles (EVs).


Pioneering research on and about bicycles at VTI

Under what circumstances might cyclists lose tyre grip? What actions could then be taken to prevent a crash? VTI is currently developing a theoretical model of the behaviour of bicycle tyres during braking and steering in different situations and on different...


Virtual pedestrians create efficient stations

If more people are to choose sustainable travel, then the public transport stations of the future must be designed so that pedestrians can get where they are going quickly, without congestion or queues. The Swedish Road and Transport Research Institute (VTI)...