An exclamation point in the middle of a triangle is a conventional fault display light.
The name of this flag is "Warning danger", which means "warning" and "important warning". Applied to places and equipment that are prone to cause personal injury, etc., the purpose is to remind people of the surrounding environment to pay attention to avoid possible dangers.
Explain that the vehicle has a failure or condition that affects the normal driving of the vehicle, the general engine has an independent fault light, and other systems such as: drive anti-slip, dual clutch system, fuel filling, etc., in time to repair the vehicle or add fuel, the warning light will go out. If this sign appears on the road sign, then it means that this section of the road is a dangerous section and needs to pay attention to safety.
Red represents danger. As soon as it comes on, we need to pull over or turn off the engine for maintenance. Generally speaking, there are: oil pressure alarm lights, charging alarm lights, engine temperature alarm lights and brake fluid level alarm lights. Yellow is a warning, which means that the car has a safety hazard, although there is no sense of urgency in red, but it also needs to be dealt with as soon as possible. For example, oil system fault lights, batteries and engine (exhaust system) fault lights. Blue represents a reminder, pay attention, but also a reminder of the working status of each function of the car, such as after turning on the high beam, it is blue, reminding the driver whether it has an impact on other vehicles.