DETECTION DISTANCES OF RETROFLECTIVE ROAD SIGNS DURING NIGHT DRIVING
Detection distances were reported for road signs of different reflective intensity, colour and size perceived under varying light conditions during field experiments in night driving. If the reflective intensity of a material (irrespective of colour) was greater than 1 mcd/lux.cm sq, the median and 90th percentile detection distances for dipped headlights were at least about 700 M and 400 M respectively. For high beam lights all materials had medians of 1000 M or more. Increasing the area of a sign by a factor of 2 had the same effect on detection distance (about 175 M) as an increase of reflective intensity from about 1 mcd/lux.cm sq to 2 mcd/lux.cm sq. Dipped headlights from an oncoming car decreased detection distances of the signs by about 80-120. /TRRL/
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Corporate Authors:
Gothenburg University, Sweden
Kulturgeografiska Institutionen, Fack
Gothenburg, Sweden -
Authors:
- Bahlstedt, S
- SVENSON, O
- Publication Date: 1976
Media Info
- Features: Figures; References; Tables;
- Pagination: 9 p.
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Serial:
- Volume: 6
- Issue Number: 4
Subject/Index Terms
- TRT Terms: Color; Distance; Driving; Headlamps; High beamed headlamps; Low beamed headlamps; Night; Night visibility; Reflectivity; Reflectorized materials; Retroreflection; Tests; Traffic signs; Visibility distance
- Uncontrolled Terms: Headlamp settings
- Old TRIS Terms: High beamed headlights; Low beamed headlights; Retrodirective reflection
- ITRD Terms: 6784: Colour; 1855: Driving (veh); 1342: Headlamp; 1341: Headlamp setting; 9052: Night; 5926: Reflectivity; 4523: Reflectorized material; 6255: Test; 553: Traffic sign; 6793: Visibility distance
- Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control;
Filing Info
- Accession Number: 00147913
- Record Type: Publication
- Source Agency: Swedish National Road and Traffic Research Institute
- Report/Paper Numbers: Monog Ser.
- Files: ITRD, TRIS
- Created Date: Aug 15 1977 12:00AM