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Author (up) S Fotios, J Uttley url  openurl
  Title Illuminance required to detect a pavement obstacle of critical size Type Journal Article
  Year 2016 Publication Lighting Research & Technology Abbreviated Journal  
  Volume in press Issue in press Pages in press  
  Keywords Vision; Lighting  
  Abstract This paper investigates the illuminance needed to detect trip hazards for pedestrians walking after dark. In previous work, it was assumed that the critical obstacle height is 25 mm: further review of accident data and foot clearance data suggests instead that 10 mm is the critical height. Eye tracking records suggest a tendency for obstacles to be detected approximately 3.4 m ahead. Interpretation of obstacle detection data suggests horizontal photopic illuminances of up to 0.9 lux are required for peripheral detection of a 10 mm obstacle 3.4 m ahead, according to the scotopic/photopic ratio of the lighting and the age of the observer.  
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  Notes Approved no  
  Call Number LoNNe @ kyba @ Serial 1765  
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