The Rush wrote:
The 55 MpH speed limit was inflicted upon us [Yanks] as a result of the gas crunch of the '70s. At the time, lack of supply always beat rises in price to the punch. Since this gov't saw raising the price of gasoline as an untenable position, it imposed "the double nickel" on us, knowing that, by 60MpH, almost every car's MpG begins to drop. To sell the new speed limit, it gave birth to what I believe is one of the oldest and most famous manipulations of the public by an insult to intelligence:
SPEED KILLS.
I was living and working in the US during the double-nickel era. Yes, it was a fuel saving measure introduced c1975 by Gerald Ford, I believe. As The Rush says, "They" were very quick to seize on the "safety" aspect of this speed limit, and even quicker to get the cash machines in gear. Very soon, bumper stickers proclaiming that "55 saves lives" were seen on many cars.
Of course, in a country the size of the US, 55 was unreasonable, especially for truckers who had vast distances to cover in a limited time. And, as Rush says, it spawned an array of electronic wizardry to combat the limit. I never had a radar detector - couldn't afford the one I really wanted which was called "The Escort". The double nickel also spawned several movies such as "The Gumball Rally" and "Convoy", all about defiance of the double nickel.
Eventually, individual states, beginning with Nevada, began to abolish the limit. In NV, the limit became 70, but you could still get a $5 ticket for doing between 56 and 70 for wasting fuel. Other states followed Nevada's lead, and the whole nonsense was ended. As far as I know, many western states like Arizona and Colorado now have a 75mph limit.
In Britain, a 50mph limit was tried in 1973/74 to save fuel. And the do-gooders were quick to point out that it saved lives and should be made permanent. And then, in Feb 1974 while the nationwide 50 limit was still in force, there was a major crash on the M1 which involved all six lanes and 123 vehicles, and 5 people were killed. That put paid to the argument that such catastrophes would be impossible with a 50 limit.
The fuel "shortage" had been caused by panic buying, and by many retailers closing down, knowing that the value of the fuel in their underground tanks was about to skyrocket. Following an 8p/gallon rise, the fuel started flowing again! And more and more people began to ignore the 50mph limit, leading to its abolition.
A Europe wide 60 NSL? I don't think Germany would agree to that...