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.



Winter Road Congress 2020

The congress is held in Tempere, Finland. Anna Niska, senior research leader at VTI, lectures on sweep-salting of cycleways.

Electric Road Systems Conference (ERSC2020)

Welcome to the 4th Electric Road Systems Conference (ERSC2020), 12–13 May 2020 in Lund, Sweden

ICTTP 2020

ICTTP, International Conference on Traffic and Transport Psychology, is held in Gothenburg, Sweden.



VTI and SAFER are organising the world’s largest traffic and transport psychology conference in Gothenburg

In August 2020, VTI and SAFER are organising the International Conference on Traffic and Transport Psychology (ICTTP) in Gothenburg. ICTTP is held every four years, and this year is the seventh conference.


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