I'm not saying it's right, but I'm just saying for sake of safety, it is important to consider the roads. There are a lot of bad drivers out there and to be direct, it is not possible to correct them all. This is why I try to avoid busy roads with 55 mph speed limits with no shoulder as much as possible because most people drive 65-70 on them anyway. I do this for my own safety, because it is too easy to become distracted in a car. Besides that, when I got my license, I was not taught how to handle coming upon a cyclist and I don't know anyone who has been taught that. Almost all will pass a cyclist going full speed even when going up a hill not knowing if a car is coming up the other side. The ideal situation, everyone drives perfectly and ever cyclist rides properly and no one gets hurt. Reality is though, many bad drivers and many who don't know how to handle the situation. This is my reasoning for avoiding these types of roads whenever possible.