Tax dollars are used for interstate highways and now you're going to pay more to travel on them

IT’S THE LAW! FEDS PAVE THE WAY TO TOLL AND PRIVATIZE THE INTERSTATE HIGHWAYS AS PART OF AMERICAN UNION

On July 29, 2005, President Bush signed a bill which permits and promotes the charging of tolls on existing and planned interstate highways, bridges, and tunnels. Before the passage of the bill, known as SAFETEA-LU, or “Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users”, it was generally illegal to charge tolls on roads built with Federal funds. What’s more, the tolls collected will be automatic, requiring universally compatible toll transponder tags on every vehicle.
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http://www.infowars.com/articles/ps/toll_roads_its_the_law_feds_pave_way.htm