I believe all the country roads around here have a speed limit of 55, although the speeds vary from driver to driver.
In general the larger and more central roads, the better the shoulders and bike paths. It is legal to ride on the Freeways in Oregon, although I don't really like it. I think it is prohibited in Washington.
I'd much rather a through street that goes direct with few stop signs than one that stops every block, and doesn't go through.