I recently went on a San Juan River fly fishing trip with my dad and brothers, my brothers traveled separately, so it was just my dad and I for the 3 hour drive from Rio Rancho to Navajo Dam, NM.
My dad was visiting from Florida for more than a week, so it was a great opportunity to interview him and ask random questions to help me and my kids understand his family history as he knew it. All total I have about 6 hours of recording just talking with dad, I learned many new things that I did not know before.
Since both my dad and I wear baseball caps, it was a excellent chance to use the Hat Mic technique and my Olympus LS-10 as detailed in a previous post here.
There was a fair amount of road noise in the recording from the Toyota Tundra truck. I also noticed that the road noise level changed as the truck went over bridges and rougher patches of road.
Here is a sample of the recording so you can hear what this particular setup sounds like.
Direct link to the MP3 audio: http://tribalgrowth.com/files/2010-09-04_HatMicsOnTheRoad.mp3