Road works during night. Recommendations for the visual environment
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Original versionSINTEF Rapport A10221, 77 p. SINTEF, 2009
This NordFoU report presents the results from a joint Nordic project investigating how to provide a good visual environment at night time for road works. As a part of this it shows how glare can be reduced and its adverse effects to the motorists mitigated. The primary aim of the project was that it should result in recommendations as bases for the improvement and coordination of existing regulations in the Nordic countries by giving • Proposals regarding glare limitation • Proposals for the requirements for yellow warning/flashing lights• Proposals for the requirements on work zone illumination both with regard to the needs of the road workers and to avoid the glare of drivers • Recommendations regarding specular reflection on wet road surfaces The background for the project is that road-works very often mean a restriction of the space available for the road users and thereby also a reduction of the passability. The passage of road-works is a complicated situation for the driver and therefore poses high demands on the traffic controls used (signs, channelling devices, etc.). To avoid disturbances in dense traffic during daytime road works are to an increasing extent carried out during hours at night when traffic volumes are lower. The requirements on the traffic controls are however considerably different during daylight than during night to provide acceptable visual conditions for the road users. A considerable difficulty for the driver who is passing the work zone in the dark is to obtain a visual impression of sufficient quality despite glare from meeting traffic, yellow flashing lights, and work zone illumination. This is required to get a correct comprehension on which speed to hold and where to place the vehicle when passing the work zone.