magnum_99, I am happy to hear that you have tried this and found, as I hoped, that it reduces fatigue. I did not consider that the plugs would help in hearing horns and sirens by filtering out the background noise, which is great, nor did I expect any (temporary) isolation, but as a passenger sleep was usually the idea behind my wearing them.
I would remove them if pulled over, solving that problem.
Rather than hope that an officer that pulls alongside thinks they are hearing aids (my actual reason for mentioning that), would disguising the window-side plug as a hands-free cellphone earbud work better?
As far as road/wind noise my vehicle is only a couple years old and within average and I have spent weeks on the road with it. Also, two of my recent trips were in someone else's car and I ain't going to buy them a new one.
I usually listen to the radio in town, but tend to turn it off after a while on long drives, so that is not an issue for me.
Noise cancelling headsets sound great and I<GACK>forget that idea, too expensive for my needs.
Oh yeah, since someone mentioned it...what's the point of using a Walkman/Ipod while driving? Don't they have a stereo in their vehicle? I have seen people in new, nice cars doing this and been stumped about why.
Thanks for eveyone's comments.