Läsbarhet och synbarhet av vägmärken med reflexfolie: ett fältexperiment i mörker samt enkätstudier


Background: Road signs are crucial for informing road users and need to be bright enough to be visible and readable, but not so bright that they cause glare. The brightness levels of road signs should also be appropriate for the vast majority of road users.

Purpose: The purpose was to evaluate readability of road signs of retroreflection classes RA2 and RA3B, with regard to factors affecting the retroreflection per se, amount of light onto the signs, and how well the driver sees. Objective measures of reading distance and visual status, and subjective measures of how different categories of drivers experience that they detect, read, and experience glare from road signs were also to be taken into account.

Methods: A field experiment measured reading distance (and visual acuity and contrast); and questionnaire studies measured opinions and experiences from different driver categories concerning driving in darkness in general, and about properties of road signs in darkness in particular.



Social sustainability and just mobility

Welcome to a research workshop on Social sustainability and just mobility, 8–9 October 2019 in Linköping, Sweden

European Road Profile User's Group, ERPUG

Welcome to the sixth ERPUG meeting in Vilnius, Lithuania. 

Vision Zero for Sustainable Road Safety in the Baltic Sea Region

The second Vision Zero for Sustainable Road Safety in the Baltic Sea Region conference will be held in Tallinn, Estonia. VTI is part of the programme committee. 



Knowledge in the fight against microplastics from road traffic

The Government has commissioned VTI to develop and disseminate knowledge regarding the emission of microplastics from road traffic.


How to make autonomous vehicles coexist with other traffic

The road infrastructure must be prepared for self-driving vehicles – especially in the beginning when the concepts are still new. Researchers are contributing to this through CoEXist, an EU-funded research project in which VTI participates as the largest...


Electric roads: ‘Standardisation is an important factor for a future European transport system’

VTI employees recently arranged a workshop in Brussels on the standardisation of Electric Road Systems (ERS). ERS has become increasingly relevant as a possible method for reducing the transport sector's environmental impacts, especially in terms of climate...


Research on passenger and freight transport research

Shift2Rail is a European railway project that works actively to create innovations within the railway sector. IMPACT-2 is a project within Shift2Rail that follows and evaluates the innovation projects. How are the innovations coming along? Are they beneficial...


How vehicles can avoid accidents on newly paved roads

Friction is an important property for road safety. VTI has investigated how roads change in the first few weeks after surfacing work has been completed. Researchers recommend posting warning signs when the road is opened and waiting at least three weeks to...


VTI contributes to study on older drivers and accidents

On behalf of and in collaboration with the Swedish Transport Agency, VTI has carried out a study of older drivers and the link between illness and traffic accidents. The Transport Agency has now published the results.