Design simplicity was essential for high-speed comprehension. Since 1974, when French highways adopted 130km/h (81mph) limits, motorists had mere moments to process visual information. Typically, duplicate panels appeared 200-300 meters apart. The initial display showed only symbolic imagery to spark curiosity, followed by identification with directional arrows. The brown-and-white scheme was selected for optimal visibility under vehicle lights, differentiating cultural markers from blue-green traffic signage.
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