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Traffic Signals Traffic signals are traffic control devices for motorized and non-motorized modes of travel. The Seattle Department of Transportation (SDOT) follows standards for traffic signals published in the Manual of Uniform Traffic Control Devices (MUTCD). The MUTCD provides guidance and standards for pedestrian related features on traffic signals such as the “walk” signal (a steady white, lighted symbol of a person walking) and the “don’t walk” signal (a flashing and steady red, lighted symbol of a hand). Signal timing and push buttons on traffic signals that can activate walk signals for pedestrians are important tools to enhance the pedestrian environment and experience. Leading pedestrian signal is an adjustment to the signal timing interval allowing pedestrians more time to walk before the light turns green for the cars. Auditory pedestrian signals and visual countdowns are commonly installed to alert pedestrians when the light has changed and they have the “walk.”
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