The distribution of self-reported annoyance towards traffic noise among respondents interviewed in the 2nd telephone survey using the ISO/TS 15666 recommended questions for assessing community annoyance. Panel A, shows the response on the verbal scale, Panel B shows the range of annoyance on the ten-point numerical scale and Panel C presents the results from the numerical scale collapsed according to the following breakpoints (0+1=not at all; 2+3=slightly; 4+5+6=moderately; 7+8=very and 9+10=extremely). Collapsing the numerical scale in this manner yielded a correlation coefficient of 0.765 (p<0.001) between panel A and panel C. Bars with arrowheads on each panel delineate the range of respondents considered "highly annoyed".