INDIRECT FACTORS AFFECTING REFLECTIVE SIGNS BRIGHTNESS (ABRIDGEMENT)
HL WOLTMAN, WP Youngblood - 1976 - trid.trb.org
The design is outlined of an experiment which simulated volumes of 300, 600, and 1,500
vehicles/lane/h on a test road. All vehicles in all tests employed low-beam head lamps since
common use of lower beams is well documented and is the rule with high volumes. The
study found that for unlighted overhead signs, the single vehicle with low beams produced
luminances of 3.4 to 6.9 cd/m sq (1 to 2 ft-L). With 3 vehicles spaced at 152-m (500 ft)
increments, sign luminance for the test vehicle increased from 3.8 to 9.6 cd/m sq (111 to 2.8 …
vehicles/lane/h on a test road. All vehicles in all tests employed low-beam head lamps since
common use of lower beams is well documented and is the rule with high volumes. The
study found that for unlighted overhead signs, the single vehicle with low beams produced
luminances of 3.4 to 6.9 cd/m sq (1 to 2 ft-L). With 3 vehicles spaced at 152-m (500 ft)
increments, sign luminance for the test vehicle increased from 3.8 to 9.6 cd/m sq (111 to 2.8 …
Indirect factors affecting reflective signs brightness
HL Woltman, WP Youngblood - Transportation research record, 1976 - safetylit.org
The design is outlined of an experiment which simulated volumes of 300, 600, and 1,500
vehicles/lane/h on a test road. All vehicles in all tests employed low-beam head lamps since
common use of lower beams is well documented and is the rule with high volumes. The
study found that for unlighted overhead signs, the single vehicle with low beams produced
luminances of 3.4 to 6.9 cd/m sq (1 to 2 ft-L). With 3 vehicles spaced at 152-m (500 ft)
increments, sign luminance for the test vehicle increased from 3.8 to 9.6 cd/m sq (111 to 2.8 …
vehicles/lane/h on a test road. All vehicles in all tests employed low-beam head lamps since
common use of lower beams is well documented and is the rule with high volumes. The
study found that for unlighted overhead signs, the single vehicle with low beams produced
luminances of 3.4 to 6.9 cd/m sq (1 to 2 ft-L). With 3 vehicles spaced at 152-m (500 ft)
increments, sign luminance for the test vehicle increased from 3.8 to 9.6 cd/m sq (111 to 2.8 …