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DawnLight is a wearable device to protect the safety of highway sanitation workers, which is worn on the arm. At the same time, it is equipped with a row of red and orange LED projection lights. When the distant car approaches the direction of the sanitation workers, the LED light bar starts to flash and emit an alarm sound. The projection light warns the distant car and reminds the sanitation workers to avoid in time. The sanitation workers wearing dawn light can form an information network between them, and to achieve the function of mutual reminders and achieve the maximum protection at the lowest cost.