1. Stop sign: This sign is a red circle with a white triangle inside, pointing to a point. This sign means you need to stop. When you see this sign, you need to stop immediately, no matter where you are. If you don't stop, you may face punishment.

2. Speed limit sign: This sign is a circular sign with red numbers and diagonal lines. This sign tells you that the road you are on has a specific speed limit. You need to abide by this speed limit, or you may face fines or other penalties. No turning sign: This sign is a red circle with a white arrow inside.

This sign means that you can't turn at this intersection. If you want to turn, you need to find another intersection or detour. No parking sign: This sign is a red circle with a white "X" inside. This sign means that you can't park in this place. If you want to park, you need to find another parking space.

4. Intersection sign: This sign is a white cross pattern. This sign indicates that this is a crossroads. You need to slow down and drive carefully in this place, because you may meet other vehicles or pedestrians. One-way street sign: This sign is a blue arrow pointing in one direction.

The importance of traffic signs is as follows:

1. First of all, traffic signs provide clear instructions and information. In complex traffic environment, drivers need to understand traffic rules and instructions quickly and accurately. Traffic signs convey information intuitively through graphics and symbols, so that drivers can quickly judge whether their driving behavior conforms to the regulations, thus avoiding potential dangers or illegal behaviors.

Secondly, traffic signs help to reduce the occurrence of traffic accidents. Clear traffic signs can remind drivers to pay attention to specific driving tasks, such as stopping, turning and speed limit. By making preparations and planning in advance, drivers can better cope with various traffic conditions and reduce the risk of traffic accidents caused by violating traffic rules or driving mistakes.