Via Michelin will tell you if there are tolls and how much they will cost.
toll roads in spain start either with AP-X (as in AP-7) or with R-X (as in R-5) A-X roads (as in A-92) are for free. Also M-XX or SE-XX (as M-40 or SE-30) are for free.
The only toll roads you may encounter in your trip are the R-X around madrid, but there is always a free A-X alternative.
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