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The emergency lamp is a kind of design devote to warn the rear vehicles to get away from the opening door（especially for bicycle, electric vehicle bypass）When people opening the car door，the red light will be projected.In this way，this design can reduce accidental injury.
The projection lamp is arranged on the lower right of the door.When the car door is opening, The red light area (length) is increasing with the increase of the angle of the door opening.
Shuo LI ,
Jiajun ZHOU ,