How many decibels is the noise of ordinary cars?

The noise level of ordinary cars is below 60 decibels. According to the technical requirements of motor vehicle operation safety, the noise level inside the bus shall not be greater than 82 decibels, and the noise level at the driver's ear shall not be greater than 90 decibels. If the noise in the car is below 60 decibels, it is acceptable, and 40 to 60 decibels belong to our normal conversation voice. Vehicle engine is a noise source, which can be generated and spread through the front fender, hood, firewall and exhaust pipe. Road noise is the noise caused by the vibration of the chassis driven by the wind when the vehicle is driving at high speed, and the noise caused by the impact of sand and gravel on the chassis of the vehicle.