As an afterthought I wouldn?t be at all surprised if imposing limits actually causes the accident rates to go up.
Sound stupid you think? I suspect that if limits like that are imposed then the sensible safe drivers who generally abide by the law will continue to do so and occasionally get done for doing say 80 or 90. The more dangerous/reckless drivers though who generally don?t hold any regard for other road users will continue to go as fast as they do now, the difference being is that they?ll avoid the main roads where there will be more cameras/speed traps, and will instead drive like nutters on twisty little backroads which are much more unsuitable for driving fast.
They WILL continue to do it I?m sure, so where will there be more accidents? A nice open road like the mountain road, or a little country road with hedges so you can?t see what?s coming, worse surfaces, muck on the roads from farms, and potentially a horse or herd of cattle around each corner? I know which I would rather go quickly on & be less likely to have an accident!