What is the standard for interior noise at 120 km/h?

[DiGage]

If the car speed reaches 120 km/h, the interior noise should be below 69 decibels to meet the standard. Normal car interior noise standards: Generally, the noise inside a sedan should be below 60 decibels to be considered normal. 40-60 decibels is the range for normal conversation. According to GB-1495-2002, the exterior noise limit for small cars (M1 category vehicles) is 74 dB(A) (decibels). Currently, there is no mandatory standard for car interior noise. Introduction to car interior noise: When a car is running, it generates noise, causing noise pollution both inside and outside the vehicle. Generally, interior noise mainly comes from engine noise, road noise, tire noise, wind noise, resonance noise, and other sources.