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Störande ljus vid vägarbeten om natten: pilotförsök 1 och 2: mötesseparerad landsväg
Swedish National Road and Transport Research Institute.
2008 (Swedish)Report (Other academic)Alternative title
Disturbing lights at road works during night – pilot tests 1 and 2. Roads with median barriers (English)
Abstract [sv]

In order to avoid disturbances in heavy traffic during daytime, road works are carried out to an increasing extent during off-peak hours at night. The demands on the design of the work zone traffic control differ, however, considerably between daylight and darkness in order to achieve visual conditions that are acceptable for the road users. In order for the driver to be able to pass in a safe way the design of the work zone traffic control should not be possible to misunderstand. One requirement is that the visual conditions are good. The latter means that the strength of the total glare from opposing traffic, warning lights, work vehicles and work zone illumination must be limited. During night time the pavements are often wet or damp, particularly during winter time, which increases the reflexion in the pavement. The reflexion can conceal the road markings, alter the colour of the signs and markings, contribute to the glare and increase the complexity of the visual information to the driver. The risk is that the driver then misunderstands/misjudges the information and drives into the work zone. Within NORDFOU it has been decided to carry out a large co-Nordic project to investigate how to best avoid problems with glare and provide a good visual guidance at work zones where work is carried out during night time. The objective of the whole project is to improve the safety both for the road users passing the work zone in the dark and for people working within the work zone, and in particular road works during night time on major roads. Previously, primarily during the year 2005 fore preliminary studies have been carried out within the project concerning yellow running lights, work zone illumination, methods for measuring glare as well as reflexion on various types of pavements. In this report two pilot studies are described, both dealing with stationary road works on "2+1"- roadways, which were carried out during spring and autumn 2006, respectively. The first pilot study was carried out on an airfield outside Copenhagen, Denmark, where a work zone was built up on a runway. Two types of work zone illumination and a number of different variants of running lights (brightness, frequency, sequence, etc.) were tested. All assessments were made by a panel of experts consisting of the members of the project team, who were standing on a fixed distance from the work zone. Pilot study 2 was carried out on a real 2+1 road outside Linköping, Sweden, where a stationary work zone was established on the single lane part of the road. The pilot study included driving tests where the test subjects (drivers) were people older than 50 years. In this way a more realistic situation was obtained where the assessments were done when the test subjects drove past the work zone. The test subjects had to answer a questionnaire, and the speed of their vehicles as well as the speed of the ordinary traffic passing the work zone was registered.

Place, publisher, year, edition, pages
Linköping: VTI., VTI notat 25-2008 , 2008. , 78 p.
VTI notat
Keyword [en]
Work zone, Warning, Flashing light, Yellow, Lighting, Glare, Night, Luminance, Measurement, Driving, Test
Research subject
Road: Highway design, Road: Safety devices
URN: urn:nbn:se:vti:diva-1681OAI: diva2:670393
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03

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