A red chimney sign appeared on the bus.

This is a warning light or sign. The red chimney sign indicates that the vehicle is in a dangerous or emergency state and needs to attract the attention of other vehicles and pedestrians. This is a warning light or sign. Specifically, this sign is generally located at the height of the car body, which can be a flash, a light bar, a flag or a signboard with a red warning reflector. When driving, if you see this sign, you need to pay special attention to the driving state of the vehicle and take avoidance measures according to the actual situation to avoid accidents. At the same time, if this sign appears on the bus, drivers and owners need to pay attention to whether there are potential safety hazards in the vehicle, and conduct timely investigation and maintenance to ensure road traffic safety.