What are the types of car signal lights and what are their functions?

There are turn signals, hazard warning lights, side marker lights, brake lights, and reversing lights. Turn signals are used when a vehicle is making a turn, informing vehicles and pedestrians ahead and behind of its intended direction of travel. If a vehicle breaks down, pressing the hazard warning lights alerts following vehicles to give way. Side marker lights are used to indicate the vehicle’s width and outline when driving or parking at night.


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There are turn signals, hazard warning lights, side marker lights, brake lights, and reversing lights. Turn signals are used when a vehicle is making a turn, informing vehicles and pedestrians ahead and behind of its intended direction of travel. If a vehicle breaks down, pressing the hazard warning lights will alert following vehicles to give way. Side marker lights are used to indicate the vehicle’s width outline when driving or parking at night.

The brake lights are installed at the rear of the car and emit a light signal to vehicles behind when the car brakes, slows down, or comes to a stop, thereby alerting following vehicles and pedestrians. The reverse lights are located at the rear of the car, one on each side. They illuminate the road behind the vehicle and warn vehicles and pedestrians behind that the car is reversing.

Traffic lights enable other road users located at a certain distance to clearly recognize the light signals. The parameters of these lights that are relevant to this include luminous intensity, luminous area, beam divergence angle, and color of light. To ensure that light signals are easily identifiable at night against a dark background, the luminous intensity of traffic lights used exclusively at night—such as side marker lights and parking lights—is typically only between several candelas and tens of candelas. For traffic lights used both day and night—such as turn signals and brake lights—the required luminous intensity during daylight hours generally reaches up to hundreds of candelas.

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