Pludo STEM Kit Automatic Traffic Signal – Controller-Based Circuit Learning Toy for 11–14 | Grade 6–8 DIY Toy waterproof sensor smart home devices

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Pludo STEM Kit Automatic Traffic Signal – Controller-Based Circuit Learning Toy for 11–14 | Grade 6–8 DIY Toy waterproof sensor smart home devicesPludo STEM Kit Automatic Traffic Signal Controller Based Circuit Learning Toy for 1114 Grade 68 DIY Toy In 1968, the United Nations Agreement on Road Traffic and Road Signs and Signals stipulated the meaning of various signal lights: green light is a pass signal, red light is a stop signal, and yellow light is a warning signal. Since then, this regulation has been applied all over the world. The emergence of traffic lights enables effective traffic