Upptäcktsavstånd till oskyddade trafikanter i mörkertrafik: resultat från en fältstudie i stadsmiljö


Studies concerning visibility in traffic have previously been carried out with the aim to investigate the longest distance possible to perceive for instance a vulnerable road user under varying conditions. In real driving however, the driver has a driving task that includes both manoeuvring the vehicle and evaluating to evaluate the present traffic situation and act accordingly. Detecting relevant objects in time to react to them is a part of the driving task, while the visibility distance is the longest possible detection distance.

The aim of the prevailing study was to explore detection distances under real night-time driving conditions, in relation to road lighting, to the movement pattern of vulnerable road users, and to the stopping distance. In addition, the influence of the instruction on drivers’ glance behaviour was examined.

The study was conducted as an urban field study with vulnerable road users in night-time traffic. The participating drivers were instructed to tell directly when they detected a vulnerable road user, whereby the detection distance to the vulnerable road user was registered. The road surface illuminance and the illuminance at a conceived vulnerable road user on the pavement were measured at night-time on separate occasions, while the influence of the instruction was investigated by use of eye tracking equipment.

The results showed that there are other factors in the urban environment that influence the detection distance more than road lighting. Persons moving across the road are detected at longer distances compared to those moving along the road or standing still. Though it is not common, there are occasions when the stopping distance can be longer than the detection distance. Glance behaviour was not affected by the instruction to any large extent.



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.