Legibility and contrast requirements of variable-message signs : Colomb, M and Hubert, R in Highway Systems, Human Performance, and Safety 1991 Transportation Research Record No. 1318, Transportation Research Board, National Research Council, Washington, DC (1991) pp 137–141 (7 refs)

Abstract

New technologies such as optic fibers and light-emitting diodes are now used for information matrix signs. A field study was carried out to evaluate the best conditions for the legibility of these signs during the day and at night. For legibility criteria, the contrast between the letters and the sign background is chosen for daylight conditions and the luminance of the letters for night conditions. The performance of some commercially available signs is compared with the study results.