Switzerland and the UK are a couple of the safest counties in the world for road deaths, with the UK usually being the best of the larger countries.
On the road quality - the UK roads aren't great in places (and getting worse based on my own subjective experience) but there are others that are worse. When we did a motorhome trip a few years back that covered about 5,000 miles across 10 European countries the worst 2 for road quality were Belgium and Portugal (although in both cases their motorways were pretty good). The individually worst roads we encountered on the trip were actually in Spain, however generally their roads seemed pretty good.