I would say you are safer to move into the lane and maintain speed and hopefully the drivers see you and give you room. Hard to say with a 55mph limit though, that can be sketchy. I would at least call department of trans and report the road for clean up.
I commute nearly every day, and am lucky that 95% is dedicated bike lane and I live in a very bike friendly part of the country. Boulder CO
The one section that has a terrible shoulder is only 25mph, and I can maintain that, so I use the entire lane. It's rush hour and I'm much safer in the middle of the road with the flow, than on a potholed shoulder getting pinched between cars and the curb.
Ferg
