To TittyGolightly and others who seem to think it's not an issue to exceed 70 miles an hour on a motorway - you are breaking the law, the road conditions, your driving experience, type of car are all irrelevant. If you can't drive within the law, get off the road. I hope that one day very soon you learn to drive properly!
you can't just lump together lots of disparate views as it not being an issue...
no-one denies that above 70mph is breaking the law - of course it is... but that has nothing to do with safety - the original debate - as above - there are times when driving within legal speed limits could be unsafe, and times when driving outside them could still be safe. As a driver, your first duty is to safety, observing the law is not the no 1 priority...
equally we should remember that law is simply a construct of current politics - lets say parliament were to change and a new party made all motorways derestricted - would 90mph be unsafe today, but suddenly be safe in a month's time because it becomes legal...? of course not - as with Isle of Man's derestricted areas, or Germany etc. - safety and speed are not mutually aligned...
So, you are right, above 70 is currently outside the law, but that doesn't make it unsafe...
sadly, for your argument, a lot of the more unsafe drivers on our roads do things that are unsafe because they believe they can because they are still within the speed limit - I am legal, ergo, I am safe... (see my example above about cyclists and the driver I saw this morning...)
the modern obsession with speed values and 'legality' at the expense of safety is itself the cause of many more accidents than excessive speed alone... I am not condoning breaking the law - but trying to explain why an attitude just generated by 'under 70 = safe / above 70 = illegal and therefore unsafe' is itself a dangerous attitude...
ultimately it is an issue for the driver alone as to whether they are legal / illegal - they alone pick up those consequences with speeding points / courses / higher insurance / etc.
it is an issue for everyone if a driver is unsafe - therefore safety must be the first and most important and in fact only consideration - none of my business or anyone else's if TittyGolightly decides to drive above 70mph if that driving is safe - the only consequence could be for them alone - however it is everyone's concern if a driver is unsafe - and that happens as much below the speed limit as it does above
so let's stop being irrational and going on about legality and safety in the same discussion - they are not the same thing - lets talk about how drivers can be safer and that will benefit everyone...