Noise annoyance can be defined as a state of irritation resulting from a continued exposure to a noise source. To evaluate the relation between exposure to noise and annoyance standard annoyance questionnaires and scales are used. In these questionnaires, respondents are classified as highly annoyed when they choose a high position on the annoyance response scale. Thus, “high noise annoyance” describes the fraction of the population with the worst annoyance outcomes due to road traffic noise.