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Vägbelysningens betydelse för fotgängares synbarhet i mörker
Swedish National Road and Transport Research Institute, Traffic and road users, Human-vehicle-transport system interaction.
Swedish National Road and Transport Research Institute, Traffic and road users, Human-vehicle-transport system interaction.ORCID iD: 0000-0001-5769-7193
2012 (Swedish)Report (Other academic)Alternative title
The influence of road lighting on the visibility of pedestrians (English)
Abstract [sv]

Fotgängares synbarhet i vägbelysning har registrerats i en fullskalig mätserie. Synbarheten har kvantifierats med upptäcktavstånd till en fotgängare som står i begrepp att korsa en gata vilket har mätts med sex försökspersoner som suttit som passagerare i en personbil. Två fotgängare har stått längs en gata och försökspersonernas enda uppgift var att med en tryckknapp registrera då de upptäckte en fotgängare som stod i begrepp att korsa gatan. Försöksplatsen låg i ett industriområde med ingen eller obetydlig annan trafik, varför mätningarna kunde genomföras utan möten eller andra störningar. Mätningar gjordes i fyra belysningsbetingelser: 100 % eller 65 % effekt på samtliga ljuskällor, 100 % på varannan ljuskälla med varannan släckt samt slutligen helt utan vägbelysning. På så sätt uppnåddes medelluminanserna på vägytan 1,0; 0,5 och 0,0 cd/m2 för luminansjämnheten 0,4 samt luminansjämnheten 0,0 och 0,4 för medelluminansen 0,5 cd/m2. Fotgängarens klädsel var endera ljusgrå eller svart och positionen längs vägen endera strax bakom en ljuskälla eller mitt emellan två ljuskällor. Varje försöksperson mättes två eller fyra gånger i varje betingelse. De oberoende variablerna var således belysningsbetingelse, klädsel och position enligt ovan, medan beroende variabel alltid var upptäcktavståndet.

Abstract [en]

The visibility of pedestrians has been measured in a full-scale field experiment. The visibility was quantified by the detection distance to pedestrian who is about to cross a street. Six subjects, sitting as passengers in a Volvo, were used for registering the detection distances. Two pedestrians were standing on the pavement along a street and the subject’s only task was to push a button when they could detect a pedestrian. The test site was located in an industrial area with no or little traffic, and consequently, the measurements could be accomplished without any disturbance from oncoming vehicles. Four illumination conditions were used: 100 % or 65 % of full effect on every light source, 100 % on every second light source, the others switched off, and finally no road lighting at all. In these lighting conditions the average luminance of the road surface turned out to be 1.0; 0.5 and 0.0 cd/m2 with the luminance uniformity 0.4. Furthermore, the luminance uniformity was 0.4 and 0.0 at the average luminance 0.5 cd/m2. The clothing of the pedestrian was either light-grey or black. The pedestrian’s position along the road was either 5 metres behind a light source or half-way between two light sources. Every subject registered every condition two or four times. The independent variables were lighting condition, clothing and position along the road. The only dependent variable was the detection distance.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2012. , 42 p.
Series
VTI rapport, ISSN 0347-6030 ; 751
Keyword [en]
Lighting (street), Pedestrian, Visibility, Clothing, Colour, Darkness, Field (test), Measurement, Visibility distance
Keyword [sv]
Väg- och gatubelysning, Fotgängare, Synbarhet, Kläder, Färger, Mörker, Fältförsök, Mätning, Siktsträcka
National Category
Infrastructure Engineering
Research subject
Road: Highway design, Road: Safety devices
Identifiers
URN: urn:nbn:se:vti:diva-1831Archive number: TRV Dnr 2010/19638OAI: oai:DiVA.org:vti-1831DiVA: diva2:670622
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2014-09-22Bibliographically approved

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Lundkvist, Sven-OlofNygårdhs, Sara
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