As things currently stand, perfectly true.
The implications for car-borne tourism from Spain etc are boggling.
However, the Portuguese Govt. has to tighten its belt and so hitting tourism by chasing visitors away by charging tolls is the obvious things to do. (This is instead of provoking public sector strikes/demos à la Greece by forcing public servants to be more productive!)
However, there will apparently be certain exemptions for locally registered cars etc.
The system is not yet clear but will apparently involve electronic payment.
I have not posted about this yet as the details are still hazy AND there is still 6 months of political haggling to go!