After living and driving in Spain for 15 years this might help:
Indicators need not be used after passing the driving test.
Always overtake, on the inside or offside, because one always has to be in front of the car in front.
(The above is advice from a very good Spanish friend of mine)
You will always be cut up at roundabouts.
A lot of road calming measures are designed to rip the guts out of your car thereby providing much needed work for mechanics.
A €50 note will get you out of most situations with the police. Don't try it with The Guardia Civil. These are the guys dressed in green usually carrying machine guns.
Enjoy your drive through Spain.
