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Cycling very much heat in the morning, really need a towel to wipe.
However, behind the car will not see the bicycle position in the evening,
especially when you want to turn left or right.
So the concept of this work is the combination of riding a bike morning or night demand design.
In the morning it can to wipe your sweat , in the evening can be used as a warning sign.
Bike arm + towel + lights = Bicycle Lights Arm.
Chaoyang University of Technology
Taichung City, Taiwan