One obligation of a community is to protect its citizens from adverse environmental influences. Noise is one of these factors, Noise has documented effects on people, they can be divided into three types. The first type is a physical effect that directly and adversely effects a person's health. Hearing loss and vibration of bodily components are examples. The second type is a physiological effect that adversely effects a person's health; heightened blood pressure and general stress response are examples. The third type is psychological that adversely effects a person's welfare; examples are distraction, annoyance, and complaint.