well you can buy foams, spays, mats, and creams for your car to make it less noisy. (from the inside)
ear plugs
Some of the advantages of LPG (Liquefied Petroleum Gas) are smoother ignition, reduced engine noise, reduced engine wear and tear and improved combustion. It also provides a cleaner emission level and is better for the environment.
Being quieter.
thermal noise willbe reduce
to decrease exhaust noise
With aerodynamics.
Noise pollutants are noises in an are that doesn't normally have much noise e.g. Drilling on the road, beeping from cars
Noise blocking windows are effective in reducing external noise pollution inside a room by blocking out a significant amount of noise from entering the room.
remove fuses.answer 2 Excessive use of the car horn, is a measure of the lack of control of the driver. They make a noise when no possible benefit can accrue.The only way to reduce this is to enforce the laws.
To make a spitting noise. Often cars do this
Use Dynamat Extreme on the floor pan, it will reduce the road noise level.
Sound proofing is used in cars and jet airplanes, to name a few, in cars they line the engine compartment with it to dampen the noise from the engine from from being heard inside the vehicle. Jet air planes, they do is almost the same thing.