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I think a lot drivers who use the A55 think it is an 80 mile an hour limit the way they pass me when I,m on it
No - that was in the States. Our 70 limit was introduced in 1966 as a consequence of a four month experiment on the M6 in Cheshire. There were few changes in crash statistics. It's interesting. Modern cars are inherently safer than those in 1966, but more capable of achieving 80 quickly. The thorny question of whether speed is directly related to the incidence of serious injuries in roads has never been resolved. It's not simply 'common sense' as some would contend, and poor or inadequate driving would almost certainly remain the main cause of road deaths. Most serious road injuries are sustained in 30-40mph areas, too, so I doubt there's any real answer. But the bottom line is that the A55 is an inherently dangerous road for many reasons, not least being the lack of a third lane and hard shoulder, and the frequency of lane closures, which seem to defy logic.