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.

[StNadia]

I often drive on highways, especially at speeds of 120 kilometers per hour, so the topic of in-cabin noise standards is very practical. Generally, noise levels range between 65 to 70 decibels, equivalent to the sound of a bustling office, which can affect the comfort of listening to music or chatting with family. I've noticed that regular car models tend to have higher noise levels at this speed, and if the tires are worn or the door seals are aged, the noise can easily exceed 75 decibels, leading to ear fatigue and distraction. It's advisable to test the noise levels during a high-speed test drive when purchasing a car. Ideally, opt for models with noise levels below 65 decibels, such as some mid-to-high-end sedans that use double-glazed windows and soundproofing materials, which show noticeable effects. Additionally, regular maintenance like replacing quiet tires or checking the hood seals can effectively reduce noise. Personal experience tells me that lower noise levels make long-distance driving more relaxed and improve overall mood.

[Courtney]

As an enthusiast passionate about automotive details, I get excited when discussing the 120 km/h noise standards. The core issue is that noise levels typically range between 65-75 decibels, primarily composed of wind noise, tire noise, and engine vibrations. Having compared various models, I've found compact SUVs may reach 75 dB, while luxury vehicles like Lexus can maintain levels below 60 at the same speed, thanks to aerodynamic design and active noise cancellation systems. Relevant national standards such as GB7258 recommend not exceeding 65 dB, but the most reliable approach is checking actual vehicle certification reports. I advise fellow car enthusiasts to reference noise test data extensively and experience highway driving during test drives – lower noise levels not only enhance driving pleasure but also reduce long-distance fatigue. Installing soundproofing mats or switching to low-rolling-resistance tires can work wonders. Remember, noise reduction is a crucial factor in driving comfort.

[ElizaFitz]

Regarding driving skills, there is no unified standard for in-car noise at 120 km/h, typically around 65-70 decibels. Aerodynamic drag, tire friction, and engine sound are the main causes; well-designed cars with strong sealing can reduce it to 60. I often remind car owners to choose quiet tires and regularly check the seals when repairing cars. Excessive noise affects concentration, so I recommend prioritizing noise-reducing models.