What are the black and white signs in traffic signs?

There are several cases of black words on white background:

1. Auxiliary sign: indicates the constraint content of the main sign and the warning light content.

2. Remove the speed limit sign: it means that there is a sign ahead to set the speed limit, and it is necessary to speed limit within this interval. When you see the release sign, you can explain the speed limit before release. Of course, it is still necessary to control the speed according to the driving section. Generally, there are no more than 80 urban roads and no more than 120 expressways.

What you usually see is the text content or time area with more auxiliary signs and black characters on white background.

Logo classification:

Equilateral triangle: used for warning signs.

Circle: used to prohibit and indicate signs.

Inverted equilateral triangle: used for "slow down and yield" prohibition sign.

Octagonal: used for "stop and give way" without signs.

Fork: Used as a warning sign of "railway crossing fork sign".

Square: used for guiding signs, some warning, prohibition and indication signs, tourist area signs, auxiliary signs, notice signs, etc.

Refer to the above? Baidu encyclopedia-road traffic signs