[NeedMoreTea]

This has happened.

The UK had an escalating fuel tax in the late 90s, early 00s. At some point when petrol was around 99p a litre there were demonstrations and rolling go-slows on motorways. I think the demos may have also blockaded refineries. Stupidly, government caved and the escalator tax was neutered. Now fuel is around £1.30 a litre.

It was subtle at first, but by the time of the demos there was a noticeable effect on the roads. For the first time in living memory (mine anyway) they were getting quieter. Most people in my circle didn't seem that fussed by it, they just drove a bit less.

No idea if there was "someone" like an oil company was behind the initial idea of or organising of the demos.