There is a kind of driver that I call a Sunday Driver. They take a little spin in the country - not necessarily on a Sunday (and not necessarily in the country, come to that) - and hold all the rest of us up. They usually wear hats.
Let me explain. I have a theory that drivers have a speed centre around the crown of their heads, and that a hat (the best is a trilby) depresses the speed centre and causes the driver to drive - Very. Slowly. Indeed. Like. This. Holding up all the traffic beind them. These drivers don't use their wing mirrors, so have no idea that they are interfering in everyone else's plans.
I also hate tail-gaters, but enough of this for today. It's been a tiresome day, what with Sunday drivers and tail-gaters (and a lot of driving), and I'm now going to go away and read a relaxing book.
And eat chocolate.