Yes. There are a few that I wouldn't cycle on often but a lot aren't as bad as people think. I cycle on a 40mph speed limit dual carriageway all the time, it isn't too bad as cars tend to drive 40-60mph in one direction and in the other direction don't often go above about 50mph. Some 60-70mph dual carriageways aren't too bad either. There is one near here that I don't go on very often as it is routine for people do to a ton on it. It tends to be A roads that have slip roads and no roundabouts for many miles where people tend to put their foot down and drive very poorly.