My century route takes me through a fairly long stretch of road that has no shoulder and at one point I have to cross an interstate onramp. The first time I rode that I was scared to death I was gonna get nailed and ya know what?......I didn't. The majority of the drivers out there are very considerate to bikers, I've even had people slow down to let me cross over (I wish they wouldn't but there ya are). My route takes me out about 50+ miles from my home and I ride alone and unsupported, and I wouldn't give up that route for all the tea in China! (ok....I might be tempted for a new carbon fiber Trek - but I'd have to think about it pretty seriously). I just make sure I have my cell phone with me and I let several friends know I'm riding a century that day so they keep their phones with them in case I get into trouble. I think you'll be pleasantly surprised at how considerate most drivers will be to you, especially out in the country where they have plenty of room to pass you. Go! Enjoy the scenery! and tell us all about it when you get back!!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"