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destination signs now in use in North America and Europe are electronic signs. In the US, the Americans with Disabilities Act of 1990 specifies certain design criteria for transit-vehicle destination signs, such as maximum and minimum character height-to-width ratio and contrast level, to ensure the signs are sufficiently readable to visually impaired persons. In the 2010s, LED signs have replaced flip-dot signs as the most common type of destination sign in new buses and rail transit

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