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“Intelligent” road signs that change color depending on the viewing angle have been developed

A new technology that could allow better visualization of road signs in the dark was developed by researcher Limin Wu of the University of Fudan, China, in collaboration with other scientists.

Wu and his team have developed a thin film that reflects light in particular ways, brightly shining or changing color in the dark. The study, published in Science Advances, describes this film made from polymeric microspheres attached to the sticky side of a transparent ribbon.

When a white light, for example, illuminates this film during the night, or at least in the dark, certain observers will see one color while another will come in another, depending on the angle of observation or if the same light source is moving less.

Extremely useful features regarding the “intelligent” road signs were noted by Qiaoqiang Gan, professor of electrical engineering at the University of Buffalo who contributed to the study: “If a person is listening to music at high volume or not paying attention while walking or driving, a signal that changes color can help alert you better to the traffic situation.”