Syns jag bättre med en gul plexiglasskiva framför strålkastaren?: en studie om motorcyklisters synbarhet i trafiken


Approximately half of the motorcyclists that are killed or injured occur when interacting with other vehicle-users. These accidents are typically intersection, head-on or rear-end collisions. A contributing factor to these collisions can be the difficulties that other road users have in detecting the motorcyclists and thereby correctly deducing their position and speed. All motorised vehicles in Sweden have a mandatory daylight running lights (DRL) requirement. The main purpose of this project was to examine possibilities of increasing the conspicuity of motorcyclists by using a yellow Plexiglas disc or sheet (yellow glass) placed in front of the motorcycle’s headlight. The project comprised four studies viz. 1) a field study, 2) a laboratory study, 3) an interview study and 4) a questionnaire study. The results from the field and laboratory studies suggest that the maximum amount of conspicuity is achieved when yellow and white light are combined; one with yellow and one without. The results from the interview and questionnaire studies show that the motorcyclists that drive with the yellow glass, perceive that their own conspicuity had increased. They believe that they are detected by other road users earlier and more easily especially in certain traffic environments and ambient lighting/weather conditions. This had also contributed to an increased sense of security by the yellow glass group. Am I more conspicuous with yellow glass? The results from this project suggest that the answer is yes, in certain circumstances. This must however, be qualified by the limitations of the studies in this project where all traffic situations, weather conditions and lighting conditions have not been assessed.



Millions for research into maritime transport and the environment

Maritime transport is a major source of emissions of harmful air pollutants and carbon dioxide. In a new project, a research team from the Swedish National Road and Transport Research Institute (VTI) and the University of Gothenburg has received SEK 6.4...


New research programme for more efficient travel

The Swedish National Road and Transport Research Institute (VTI) is playing an important role in a major new research programme to find radical solutions leading to fewer trips and more efficient travel, along with tools to enable better use of roads and...


Simulator used to practice emergency responses safely

Emergency responses of the police, ambulance, and rescue services are associated with a high risk of accidents, but practicing them in real traffic is neither safe nor permissible. A simulator-based method developed by the Swedish National Road and Transport...


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...