Any weird road rules I should know about before I drive in Spain?

[spacedonkey]

Title says it all really. I've never driven there before - anything I should be aware of?

Drive defensively, in terms of paying attention to other people who could be inclined not to follow the rules as they are. And keep telling yourself "keep right"

When you are overtaking on a dual carriageway/motorway leave your indicator on

excellent, ta for these!

in italy you have to leave your headlights on at all times - is it the same in spain?