It tells the story of Xiaona's longing for her sister Xiaojia's new bicycle, as well as her challenge of not being able to legally ride it due to being under twelve years old. Xiaona secretly learned to ride a bicycle and rode her sister's bicycle out during the winter vacation. She was attracted by the racing behavior of other teenagers and eventually had a traffic accident due to illegally entering the motor vehicle lane. The accident resulted in Xiao Na being injured and her bicycle damaged. She and her parents bear full responsibility and related expenses for the accident. The chapter emphasizes the serious consequences that may arise from minors violating traffic rules due to their lack of experience and safety awareness, and provides relevant provisions on non motorized vehicle driving in the Implementation Regulations of the Road Traffic Safety Law of the People's Republic of China.