1, red is often used for warning lights, emergency stop handles or buttons on machines and vehicles, as well as fire-fighting vehicle equipment and fire warning signs.
2. Yellow means warning and attention. It can produce higher brightness than red to people's eyes, which is very attractive and visual and can attract people's attention. Therefore, yellow is used as a warning color, such as the center line of the lane, helmets, signal lights, signal flags, warning lines around dangerous machine parts and pits, and warning signs for athletes who commit serious fouls in sports competitions.
Legal basis: Article 25 of the Road Traffic Safety Law of the People's Republic of China implements national unified road traffic signals. Traffic signals include traffic lights, traffic signs, traffic markings and the command of traffic police. The setting of traffic lights, traffic signs and traffic markings shall meet the requirements of safe and smooth road traffic and national standards, and shall be clear, eye-catching, accurate and intact. According to traffic needs, road traffic signals should be added, replaced and updated in time. The addition, replacement and updating of restricted road traffic signals shall be announced to the public in advance and widely publicized.