READABILITY OF SELF-ILLUMINATED SIGNS IN A SMOKE-OBSCURED ENVIRONMENT
This study investigates the ability of people with normal distant visual acuity to identify self-illuminated emergency signs in a smoke-obscured environment. The results indicate that signs whose background luminance meets or exceeds the requirements of Federal Aviation Regulation (FAR) 25.812 are readable under favorable conditions when the total optical density of the smoke between the observer and the signs ranges between 3.00 and 3.55. Substantial increases in character sizes in the signs produce only moderate improvement in readability. Some limitations on the practical application of these data to predicting sign visibility in adverse conditions are discussed. (Author)
- Record URL:
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Corporate Authors:
Federal Aviation Administration
William J. Hughes Technical Center, Airport Technology Research and Development Branch
Atlantic City International Airport
Atlantic City, NJ United States 08405 -
Authors:
- Rasmussen, P G
- Garner, J D
- Blethrow, J G
- Lowrey, D L
- Publication Date: 1979-11
Media Info
- Pagination: 11 p.
Subject/Index Terms
- TRT Terms: Aircraft; Aviation safety; Character recognition; Communication systems; Emergencies; Fires; Information display systems; Intersection elements; Legibility; Luminance; Performance tests; Personnel performance; Signals; Smoke; Visibility; Visual perception
- Uncontrolled Terms: Intelligibility
- Old TRIS Terms: Aircraft fires; Obscuration; Performance human; Screens displays; Visual signals
- Subject Areas: Aviation; Vehicles and Equipment;
Filing Info
- Accession Number: 00313226
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: FAA-AM-79-22, FAA-ARD-79-108
- Files: NTIS, USDOT
- Created Date: May 21 2003 12:00AM