It is marginally more dangerous. Imagine a line between 50 mph and 150 mph, the danger increases as your speed increases. That said there are definitely times when it is safer to be doing an illegal 80 on this lovely clear motorway you speak of compared with a legal 70 on a very busy motorway.
We have the technology, we just don't want to use it, because we like going fast down motorways. Normally sane adults acting dangerously because it makes us happy 😊