I would guess that you know Jeremy, but others may not, that you can avoid tolls on the A22 on specific sections of the route. The locals use them. They lie between the pontos de cobranca. They usually cover just two or three junctions as marked on the plan here
http://www.portugaltolls.com/documents/11238/85d46990-3228-4cff-a4fc-6064fb22b243
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