New research revealed that driving a convertible sports car with roof down at high speed may seem like fun, but people who go 55 miles per hour may be increasing the risk of hearing loss over the time.

It produces enough noise when passing through loud vehicles such as bus or motorcycle.

The research was carried out by the National Institute of Occupational Safety and Health which says the decibel levels greater than 85 are consider excessive, higher the speed more potential ear damage.

The researchers used sound meter to detect the level of sound and found driving at 55 mph with the top down produced sound level measures above 85 decibels in 80% of convertibles tested.

In experiment 5 cars were used - a Ford, a Nissan, a Saab, a Saturn, and a Porsche at different noise levels – 55mph, 65mph and 75mph.

Saturns had more noise both at lower and higher speeds, when tops were down and when tops were up, the Porsche model was the noisiest car.

The quietest car was found the Saab, a 2005 Aero model.