History
First proposed by the UK Government in 1993, shadow tolls have been widely used in the UK and also to a more limited extent in other countries, including Belgium, Canada, Finland, Netherlands, Spain and the United States. Portugal introduced schemes in 1999 but replaced these with the public tolls in 2004.
The use of shadow tolls in the UK has reduced over time with PFI funded project payments being made based primarily on the availability of the road, and not on the number of vehicles using it. Beyond a certain number of vehicles, the 'toll' paid by the government in more recent schemes is zero.
Read more about this topic: Shadow Toll
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—Karl Marx (1818–1883)
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—David Hume (1711–1776)