Triboelectric nanogenerator for smart traffic monitoring and safety

Traffic monitoring and safety are key for reducing road accidents because the road network is increasing rapidly and becoming completed day by day. Various energy harvesters and sensors have been invented for analyzing the factors involved in traffic movement like vehicle, road and environment. Among those, triboelectric nanogenerator (TENG) is considered to be advanced and next generation self-powered sensors and energy harvester. Therefore, TENGs are widely studied and developed with various mechanism and structure. In this review article, we have studied the several mechanisms specific to the key elements of traffic monitoring such as vehicle, road and environment. Since, without studying the shortcomings of the TENG, it is difficult to update the smart traffic monitoring system therefore along with the detailed study of several the design, structures and mechanism of TENG, challenges and limitations have also been reviewed which will benefit the researchers working in this area and enhance the improvement in traffic monitoring and safety.