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People who walking on the streets always stare at the phone when waiting for traffic signals turning into green. This concept is talking about a way to notice them that it is time to go.
Walker is an application on Smartphone; user can use it by tapping the phone on the Walker-broad. By NFC (Near Field Communication), the phone will receive the data, the remnant time, and countdown in background. When time is running out, Walker will pop-up on the screen to notice the user.
Chiu, Chi Kuan