(I) The impact of noise from traffic may be reduced by the installation of special equipment on motor vehicles and by urban development plans. (II) The precise health and environmental effects of noise pollution are not fully known. (III) Prolonged noise exposure may cause general personal stress, and even permanent damage to the auditory system. (IV) Exposure to moderate intensities in the environment affects the cardiovascular system, but no definite permanent effects on the circulatory system have been demonstrated. (V) Moderate noise levels have been known to cause vasoconstriction of the peripheral areas of the body and pupillary dilation, but there is no evidence that these changes are harmful over time.