Nowadays, many companies have begun to develop unmanned vehicles. In this field, France's Navya has been at the forefront. Its Arma automatic bus was officially opened in Las Vegas, USA in January 2017. Gass conducted a two-week, eight-hour trial run every day, and there were no security incidents during the test. In order to ensure safety, the local security department stipulated that the maximum speed limit during testing was 19Km/h. High pressure carbon steel with
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