Noise is being generated more and more everyday from different factors in the world but the most generating to it is the road traffics that is causing many problems for the environment especially the humans as it puts them in health danger were they can have some disabilities such as hearing problems and also mental health problems where they can not have tranquillity.This study will focus on the studying different type of vehicles with different engines based on the International Standard Organization to find out which type of vehicles is the safest for the environment, moreover what are the most factors generating the noise so later on the vehicles manufacturers will take that in consideration and work on improving it such as higher quality of noise absorbing material used in different part of the vehicles.