Question
I am curious as to what the actually decibal level is inside a moving truck and a stationary truck. Also what is the rate of hearing lose among truck drivers. If anyone knows or can guide me to this information I would be greatly appericative.
Answer
The information has been collected by the Dept. of Transportation for the Federal Aviation Authority and was put out in a little booklet about twenty years ago which I recently discarded. Should be available from FAA, Oklahoma City Oklahoma, Aeromedical Division. The decible levels were linked to hearing loss, and the recommendation was to wear hearing protection at all times. Of course the pamphlet dealt with cockpit noise, which in a some aircraft is comparable to a diesel with the windows down (in my opinion). The downside of hearing protection is you can't hear emergency vehicle sirens well. The wrap around shooting muffs are the most comfortable.
Answer
Most of the newer trucks I've seen write-ups on in the truck mags have shown dB levels in the upper 70's. not bad compared to older models and comparable to most cars nowadays.
I'm in my mid 30's with 15 yrs in trucks and I've noticed some loss in the upper ranges and more trouble with background noise interference. I've had noticable tinnitus for at least ten years. (my early trucking years were in the oilfield before I got smart enough to wear plugs around high dBs)
Answer
Thank you. I am grateful for these sources.
------------------
Nam Myoho Renge Kyo