Noise exposure and convertible cars

A minimal trend toward increasing noise levels with speed was noted for the speeds tested. A statistically significant difference in noise reduction was found by raising the car windows. Although average levels were noted to be above the 85 dB criterion level legislated by some organizations, the length and frequency of most car journeys with the convertible roof lowered is unlikely to significantly increase the noise exposure risk of most individuals. Future studies may be able to evaluate whether a temporary threshold shift phenomenon may occur.