Definition of Traffic Signal
Release time：
2023-03-02 14:23
Source：
In the intersection, four sides are hanging red, yellow, green, three color traffic signal, it is silent "traffic police". Red and green lights are the international unified traffic signals. Red light is the stop signal, green light is the signal to pass. Intersection, several directions to the car are gathered here, some want to go straight, some want to turn, in the end let who go first, which is to listen to the traffic light command. Red light is on, prohibit straight or left turn, in the case of pedestrians and vehicles, vehicles are allowed to turn right; green light is on, allow vehicles to go straight or turn; yellow light is on, stop at the intersection stop line or pedestrian crosswalk line, has continued to pass; yellow light flashes, warning vehicles pay attention to safety.
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Main characteristics of circuit breakers
The characteristics of the circuit breaker are mainly: rated voltage Ue; rated current In; overload protection (Ir or Irth) and short-circuit protection (Im) decoupling current adjustment range; rated short-circuit breaking current (industrial circuit breaker Icu; household circuit breaker Icn), etc.
The history of signal light development
In 1858, a mechanical wrench type signal in red and blue with coal-fired gas as the light source was installed in the main street of London, England to direct carriages to pass. In 1868, British mechanical engineer Naite installed the world's earliest gas traffic light in the square in front of the Palace of Westminster in London.
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The scientific basis of the light color of the traffic signal
In the earliest days, there were only two colors, red and green, and later, after improvement, a yellow light was added. Red light means stop, yellow light means ready, and green light means pass. The reason why these three colors were adopted and used as traffic signals is also related to people's visual structure and psychological response.
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