I have become convinced that people get addicted to speed. One of the fastest ways to make some people's blood boil is simply making them drive a little slower; even if it's so marginal that it can't actually possibly affect when they arrive at their destination they become furious.

The US loves to have wide, straight roads with great visibility and no obstacles on which cars could easily, safely do 80MPH (in the absence of other drivers of course) but with artificial limits of 30-40 miles per hour that everybody obviously ignores because - hey, just look at the road, it's begging for people to go faster. The Netherlands by comparison generally does a great job of managing drivers' expectations by adding artificial curves, places where cars have to gently swerve, setting trees along the roads that give a feeling of constraint and not "wide open place to floor it", etc. Of course you still see people here losing their minds because they have to wait for pedestrians to cross once the light turns green, but it's not as bad as my experiences in the US.