Jerez
Route 57 near Eyrarfjall

I was livid. Iceland's rural roads are not normally paved and normally it is not a big problem, but there were a couple of big obnoxious trucks going back and forth and they worked the surface into shiny slime. 30 km of it. And guess what they were ferrying? Earth, lots of it. I clinged to my sanity by shouting every possible word of abuse at them. Sorry, guys.