Unlike some other countries, Spain certainly seems to have taken the right route to improve road safety.  In 2001, Spain was the third worst in the (old) EU for deaths and injuries on the roads, but a concerted effort seems to seems to paying off, although there is still a way to go.  There are reported to be 500 speed cameras in Spain, with many fixed, and quite a few mobile.  The fixed cameras can be located by going the the government Trafico web site where maps show exactly where they are.  This web site address is at (click)

http://www.dgt.es/trafico/radares/radares.htm

Naturally, it is in Spanish, but is easy to follow if you do not understand this language.

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