DISCUSSION
Various sources of noise pollution Traffic noise is of two types. Noise generated by individual vehicles and by continuous flow of vehicles of all types. Noise from engines and transmission depends upon the design of vehicles and particularly upon the method of support used for its moving parts. More expensive vehicles employ more elaborate damping system so that noises are not transmitted to the body of the vehicle. Considerable improvements are made to improve engine mounting systems. An efficient silencing system is able to reduce the power output to any engine. In consequence the design of the exhaust system is a matter of compromise. Systems usually designed to keep within the law without significantly affect the cost and performance.
Slamming of vehicles doors causes most of annoyance late at night, because it has been an intense yet intermittent noise of a type most likely to disturb sleep. There is no law to control it. Most of the motor manufacturers have effectively solved the problem of noisy door closure but some motor manufacturers are still turning out a vehicle which makes plenty of noise when door are closed. It is a problem which can only be solved at the design stage of a new motor model and only when there is legislation forcing motor manufacturers to reduce noiseless door-shutting devices Break squeal is particularly noticeable with modern dice brakes although drum brakes exhibit this phenomenon. It causes the vibration produced during the application of brakes resonates within the brake structure It appears that brake squeal except by introduction of some damping devices into the vehicles. All motor vehicles must be fitted with horns by law. It is found that a visual stimulus like the flashing of headlights is more effective than an audible one in attracting attention It is observed that the people's daily doing uptown are main suffers of noise pollution. Railways, traffic on national and state level highways are the main sources of noise pollution. The villages, urban cities and metropolitan cities which are linked by the national and state level highways mainly suffer from noise produced by the continuous stream of vehicles. It is observed that the people's how lived near the national and international airports are main sufferer of such kind of noise pollution. The growing urhanization