VISIBILITY UNDER NIGHT DRIVING CONDITIONS. PART 2. FIELD MEASUREMENTS USING DISC OBSTACLES AND A PEDESTRIAN DUMMY

The visibilities of a pedestrian dummy and disc objects of varying size and contrast were measured under dynamic night driving conditions on an unlit open road and in a road lighting situation for which the average pavement luminance was 0.8 cd/m2. The visibilities of the objects could largely be described by a standard luminous increment-visual area characteristic. Under road lighting conditions, negative contrasts (silhouette vision) were found to give slightly greater visibilities than positive contrasts. It was found that a contrast multiplier of 4 was required in applying laboratory 50% probability of detection thresholds to a 'just visible' criterion level of visibility in the field experiments, though in practical conditions contrast multipliers as large as 30 may be required. (a) for abstract of part I see IRRD no. 215842. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00243426
• Corporate Authors:

  Illuminating Engineering Society

  York House, 199 Westminster Bridge Road
  London SE1 7UN,   England 
• Authors:
  • HILLS, B L
• Publication Date: 1975

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 251-258
• Serial:
  • Lighting Research and Technology
  • Volume: 7
  • Issue Number: 4
  • Publisher: Sage Publications Limited
  • ISSN: 1477-1535
  • Serial URL: http://lrt.sagepub.com/

Subject/Index Terms

• TRT Terms: Anthropometry; Brightness; Contrast; Driving; Dummies; Field tests; Luminance; Night; Night visibility; Pedestrians; Speed; Street lighting; Surfacing; Traffic lanes; Visibility; Visibility distance
• Uncontrolled Terms: Field measurements
• ITRD Terms: 1618: Anthropometric dummy; 2992: Carriageway; 6794: Contrast (visual); 1855: Driving (veh); 545: Lighting (street); 525: Luminance; 9052: Night; 1733: Pedestrian; 5408: Speed; 2972: Surfacing; 6783: Visibility; 6793: Visibility distance
• Subject Areas: Highways; Pedestrians and Bicyclists; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure;

Filing Info

• Accession Number: 00134259
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jul 22 1977 12:00AM