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Fotgängares upptäckbarhet vid olika nivåer på vägbelysningen
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
2011 (Swedish)Report (Other academic)Alternative title
Visibility of pedestrians at different levels of road lighting (English)
Abstract [sv]

Denna pilotstudie har genomförts som två fullskaleförsök på Tagenevägen i Göteborg. Denna väg har en belysningsanläggning i vilken varje ljuspunkts effekt kan regleras oberoende av övriga ljuspunkter. Detta möjliggör en reglering av medelluminansen så att skilda nivåer på denna kan studeras för konstant luminansjämnhet och vice versa. Det första försöket genomfördes med fem försökspersoner som satt som passagerare i en personbil som framfördes på Tagenevägen i cirka 50 km/h. Deras enda uppgift var att trycka på en ljudlös knapp då de upptäckte en ”fotgängare”. Denna fotgängare bestod av ett gråmålat hinder – mörkgrått på den ena sidan och ljusgrått på den andra – placerat på den högra trottoaren. Försöket flätades fullständigt så att alla belysningsbetingelser studerades för två fotgängare – en alldeles bakom en ljuskälla och en mitt emellan två ljuskällor – och två olika nivåer på fotgängarens ljushet.

Det andra försöket gjordes med en förenklad datainsamling och endast två försöksper-soner. Fotgängaren var nu en människa (ingen attrapp) och dess position var mitt i egna körfältet, varför bakgrunden till största delen kom att utgöras av den upplysta himlen och endast till en liten del av vägytan. Detta kan sägas representera en optimal situation med avseende på upptäckt och de registrerade avstånden var långa; cirka 100–400 meter.

Abstract [en]

In Sweden, road lighting is regulated in Vägars och gators utformning (VGU). Generally, the requirement is an average luminance level and a luminance uniformity of the road surface. An important question is if the requirements are reasonable? Too low requirements would mean poor traffic safety and too high levels would mean waste of energy and undesired impact on the environment.

In night-time traffic, accidents involving vulnerable road users are overrepresented, which may be caused by poor visibility. The aim with the present study was to investigate the influence of the average luminance and the luminance uniformity on the detection distance of pedestrians in road lighting.

Two pilot studies have been conducted as a full-scale trial on Tagenegatan in Gothenburg. This specific street has a road lighting installation where each light source can be dimmed individually. This means that both the average luminance and the luminance uniformity can be regulated independently. Thus, the effect of the average luminance can be studied at certain levels of uniformity and vice versa. In this experiment the average luminance 1.0, 0.5, 0.35 and 0.0 cd/m2 were studied along with the luminance uniformities 0.0 and 0.4.

In the first study, five subjects participated, travelling at approximately 50 km/h as passengers in a car. Their only task was to push a silent button when a "pedestrian" was detected. The pedestrian was a grey-painted obstacle, dark grey on one side and light grey on the other and it was located on the right pavement. This meant that the background of the pedestrian partly was the surface of the pavement, partly bushes close behind. The conditions were completely intertwined, which meant that six light conditions were studied, involving four pedestrians; light and dark grey, positioned just behind a light source and between two lanterns, respectively.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2011. , p. 36
Series
VTI notat ; 21-2011
Keyword [en]
Pedestrian, Visibility, Visibility distance, Light intensity, Lighting (street), Luminance, Reflectivity
Keyword [sv]
Fotgängare, Synbarhet, Siktsträcka, Ljusstyrka, Väg- och gatubelysning, Luminans, Reflexionsförmåga
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 34 Road: Safety devices; 30 Road: Highway design, 33 Road: Surfacing
Identifiers
URN: urn:nbn:se:vti:diva-1750OAI: oai:DiVA.org:vti-1750DiVA: diva2:670466
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2014-10-15Bibliographically approved

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