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Think Roads Pay for Themselves? Think Again

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The myth that U.S. roads "pay for themselves" thanks to user fees is a subject that's likely familiar to many Streetsblog readers -- but just how much of the nation's highway funding is provided by charging drivers?

The answer may surprise even active critics of the current asphalt-centric transportation system. Between 1982 and 2007, the amount of federal highway revenue derived from non-users of the highway system has doubled, according to a study released today by Subsidyscope.

Analyzing Federal Highway Administration data dating back to 1957, the dawn of the Interstate system, Subsidyscope researchers found that non-users of the highway system contributed $70 billion for nationwide road construction and maintenance in 2007. In 1982, by contrast, highway contributions from non-users totaled just $35 billion (in 2007 dollars).

Today's study also found that the share of road funding generated by user fees fell to 51 percent in 2007, down from 61 percent just a decade earlier. (The accounting used by Subsidyscope, a joint project of the Pew Charitable Trusts and the Sunlight Foundation, accounted for the use of about one-sixth of federal gas tax revenue to pay for transit.)

What has caused the government's increasingly rapid dependence on non-road user fees -- which more often than not take the form of direct transfers from the Treasury -- to pay for roads?

Subsidyscope points out that the federal gas tax has stayed stagnant since 1993, rapidly losing value as inflation climbs, but the growing popularity of bond issuances as a way to pay for new roads is also a factor. According to Subsidyscope's research, the value of new bonds issued to pay for highways reached $24.7 billion in 2007, up from just $6 billion in new bonds issued in 1982 (converted to 2007 dollars).

Bond offerings, which often represent states and localities playing a greater role in transportation planning, do not guarantee that users will be paying for new highway construction -- rather, bonds depend on market conditions to allow a successful leveraging of debt, and the recent economic downturn has forced many governments to limit their bonding plans.

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