Transportation Research Record 1899: 96-103.
#Black mesa research facility font driver
Observed driver glance behavior at roadside advertising signs.
Outline characters needed to be 1.8 times larger than solid characters for equivalent legibility.īeijer D, Smiley A, Eizenman M. Acuity for outline fonts was worse for outline fonts than for solid fonts. Legibility of outline and solid fonts with wide and narrow spacing. Acuity was slightly improved when a font with serifs was used in place of one without serifs.Īrditi A, Liu L, Lynn W. Reading speed for normal-sighted and low vision observers did not differ whether fonts has serifs or not. External lighting, if used, should not direct light into drivers' eyes.Īrditi A, Cho J. A maximum-to-minimum sign luminance ratio of 6:1 is recommended. Nighttime sign luminances in areas of low, medium and high ambient luminance should be 20-40 cd/m², 45-90 cd/m² and 90-180 cd/m², respectively. Washington, DC: American Association of State Highway and Transportation Officials. In very brightly lighted urban locations, a minimum luminance of 700 cd/m² with a maximum of 1700 cd/m² might be appropriate.Īmerican Association of State Highway and Transportation Officials. On illuminated highways or in the presence of substantial glare from opposing vehicle headlights, sign luminances between 70 and 340 cd/m² are recommended. Minimum nighttime sign luminances of 35 cd/m² are appropriate in rural locations, with a maximum of 100 cd/m². Luminance requirements for illuminated signs. Optimal sign luminances for nighttime legibility were found to be around 35 cd/m².Īllen TW, Dyer FN, Smith GM, Janson MH. Night legibility distances of highway signs. The average detection distances for signs decreased from 110 ft with minimum visual noise to 60 ft with high levels of visual noise.Īllen TM. Transportation Research Record 1553: 53-58. Influence of visual environments on visibility of traffic signs.
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