LUMINANCE AND CONTRAST REQUIREMENTS FOR LEGIBILITY AND VISIBILITY OF HIGHWAY SIGNS.

被引：0

作者：

Forbes, T.W.

Saari, B.B.

Greenwood, W.H.

Goldblatt, J.G.

Hill, T.E.

机构：

来源：

Transportation Research Record | 1976年 / 562期

关键词：

VISIBILITY;

D O I：

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摘要：

The study reported on took place in 2 parts: laboratory tests and outdoor observations. In the laboratory tests, which were conducted in a darkroom, 51 series of test signs were projected from color slides against 5 backgrounds simulating rural, suburban, and lighted city conditions. Luminances ranged from 1. 3 to 15. 1 cd/m**2. Legibilities ranged from 2. 4 to 7. 2 m/cm and increased approximately linearly with log luminance. Outdoor observations of 30. 5-cm reflective letters (2 color combinations) under headlights confirmed the lower contrast limits for legibility and effects of stroke width.

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页码：59 / 72