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Large bus or lorries have behind vision died corners, always hurt pedestrians when reversing, often result in injury or death, so in this design of large truck rear warning notice button is needed,it could save many people lives, when dangerous, people can push big push bar will notice the driver's seat and reporting audible warning light, instantly alert someone to pay attention to driving the rear view, thus reducing casualties, but also to give people a chance to dodge.
National Cheng Kung University
I Jui Lee