Regarding the maintenance of expressways, sign lighting by nightly searchlight is a concern for light hazards and traffic safety. I would like to ask for appropriate guidance to related areas, thank you. Astronomical observation, science education: Astronomical observation requires a dark night sky. Japan boasts one of the world's leading campaigns and achievements in citizen (amateur) astronomical activities, and specialized astronomers at universities, research institutes and science educational facilities throughout the country are conducting advanced research to capture weak light from space I am doing big scientific achievements. At elementary and secondary schools, observation of stars and astronomical observations are conducted as part of science education. Measures against light pollution by the Ministry of the Environment: "Light pollution countermeasure guideline" (1998) formulated by the Ministry of the Environment and "Han...