Kantstolpars effekt på trafikantbeteendet

Thomas Engen
Riikka Rajamäki
Gabriel Helmers

In order to improve the visual guidance in night-time traffic most Nordic roads are equipped with delineator posts. The configuration of these posts vary between the countries; as an example the distance between two delineator posts is 100 metres in Denmark, while it is 50 metres in Sweden. The aim of the present study was to investigate which delineator post configuration that gives the best driving behavior. Furthermore, the optimal visibility distance of the retro-reflector of the post was estimated. The results can be used for a harmonization of the Nordic regulations regarding delineator posts. The study was conducted in the VTI and SINTEF driving simulators. The study of configuration (VTI) was validated on the real road in Finland by VTT. In the VTI simulator subjects drove in the dark a loop containing seven different delineator posts configurations, while the study at SINTEF used a loop where the retro-reflectors of the posts had a night-time visibility distance of 100, 200 or 400 metres. In both simulators the speed was registered continuously. The results show that the configuration which today is used in Denmark is to prefer. This configuration gives equal or better driving behavior than other configurations, but to a lower price. The optimal visibility distance of the retro-reflectometer was estimated to 100-200 metres.



Shipping and the environment – research meets reality

Centre for Transport Studies (CTS) in co-operation with Ports of Stockholm invite you to the seminar Shipping and the environment – research meets reality.



Simulation of cut-in by manually driven vehicles in platooning scenarios

A study in a VTI-driving simulator has showed that a platoon will be able to handle a cut in from a manually driven car. The results of this study have recently been presented at two conferences in Japan.



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.


Self-driving buses in Sweden next year?

A self-driving, fossil-free bus. This idea might become reality through a forthcoming collaborative project involving the Swedish National Road and Transport Research Institute (VTI), Linköping University and several other participants. The project group aim...


New climate-proof solutions for hard surfaces in cities

High-density road infrastructure that emphasise maximum durability and minimum maintenance create inflexible systems, which put increased stress on urban trees and lead to increased risk for flooding. Over the past five years, the ‘Climate-proof solutions for...


VTI is preparing for automated vehicles

Automation of traffic systems will lead to major changes. The European Union’s (EU) CoEXist research project began in June 2017 with the aim of preparing cities and road operators for the introduction of self-driving vehicles. The Swedish National Road and...


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...