1. Engine Size: Larger engines tend to produce more noise.
2. Exhaust System: Modified or aftermarket exhaust systems can significantly increase the loudness of a car.
3. Tire Type and Condition: Worn or aggressive tire treads can generate more noise on the road.
4. Speed: The faster a car drives, the louder it becomes.
5. Vehicle Design: Some car models are inherently louder due to their design and aerodynamics.
6. Road Surface: Cars tend to be louder on rough or uneven road surfaces.
In general, the average noise level of a typical passenger car at moderate speeds ranges between 60 to 80 dB.
However, certain high-performance or modified cars can produce noise levels well above 100 dB, which is considered to be quite loud and potentially harmful to hearing over time.