Quote:
... the Utah Department of Transportation (UDOT) has been allowed to raise posted limits to 80mph from 75mph, but because motorists were already driving at speeds greater than the original limit the effect has been simply to bring drivers within the law, rather than worsen highway safety.
Correction:
... the effect has been simply to fix the 'law', bringing 'it' within the 85th %ile.
Since the previous speed limit was already pretty close to what it should have been to begin with - the norm, as it were - it had absolutely nothing to do with highway safety at all. The UDOT didn't suspect it had anything to do with highway safety to begin with anyway.
As for the theory that it had anything to do with cause-and-effect, that only applies to those who went faster because the 'limit' went up. It would be an invasion of privacy, but I'd love to know whose speed didn't change, whose went up, [whose, if any, went down for that matter,] and why. My guess is the vast majority of drivers in that section neither sped up nor slowed down at all.
Safety only becomes an issue when there are significant speed
differentials. Since everyone was going within 5MpH of each other to begin with, and the 'law' was off by less than 10MpH, the only surprise is that an Amerikan government agency implicitly admitted that the vast majority of the drivers on the I-15 are in fact reasonable and prudent.
What makes the Law of Gravity a fact is that it is a simple observation of the truth - that, and it cannot possibly be broken.
The more often a posted speed 'limit' is 'broken' by the general public, the bigger the lie told to the public, especially if the most likely consequence for 'breaking' it is manufactured by those who choose said limit to begin with.