The kinds of traffic lights:

1, according to the shell material:

Can be divided into two kinds of metal and nonmetal materials.

2, according to the size of lighting units pervious to light surface:

Can be divided into 200 mm, 300 mm and 400 mm in diameter of signals.

3, according to the operation mode:

Can be divided into the timing signal lamp, traffic induction lights, traffic lights adjustment.

4, according to the light source:

Can be divided into the incandescent lamp and low-voltage halogen tungsten lamp, light emitting diodes, and other related standard light source.

5, according to the function:

Can be divided into motor vehicle lights, vehicle lights, turn left a non-motor vehicle lights, pedestrian signal lights, direction indicator lights, driveway lights, flashing warning lights, crossing signal lights, road and rail plane crossing.

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