I usually just avoid state highways and focus on the lower classed country roads - there aren't shoulders but the traffic volumes are quite low and there really aren't any signalized intersections. It also helps that there are a lot of cyclists who ride where I do so drivers are accustomed to look out for us. I've not seen worse than a car full of young adolescents shouting complimentary things to me. I couldn't hear what they were saying so I choose to think it was something nice