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Original file (1,239 × 1,754 pixels, file size: 39 KB, MIME type: application/pdf) This image was uploaded in a non-image format. The information it contains could be stored more efficiently in the PNG format , the SVG format , as plain text in an article , or (rarely) in JPEG format.
This file is in the public domain because it comes from the Manual on Uniform Traffic Control Devices, sign number R3-27, which states specifically on page I-1 that: Any traffic control device design or application provision contained in this Manual shall be considered to be in the public domain.
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The Stanford Sleepiness Scale (SSS), developed by William C. Dement and colleagues in 1972, is a one-item self-report questionnaire measuring levels of sleepiness throughout the day. The scale has been validated for adult populations [ 1 ] and is generally used to track overall alertness at each hour of the day.