The Tax Foundation endeavors to provide a simple explanation of road funding.

An article by Morgan Scarboro and Joseph Henchman digs into the funding mechanisms for roads in all 50 states.
Gas taxes are typically used to fund infrastructure maintenance and new projects, but the share of state and local road spending that is covered by tolls, user fees, and taxes varies drastically. It ranges from only 12 percent in Alaska to 76.3 percent in Hawaii. States like Alaska and North Dakota (funded 22.8 percent by fees and taxes) keep their transportation taxes low in the same way that they keep all taxes on state residents low, by exporting taxes (primarily through the severance tax).
The article also includes an infographic that illustrates the shortcomings of state and local tolls, user fees, and user taxes in covering the costs of state and local roads.
FULL STORY: How Are Your State’s Roads Funded?

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City of Morganton
San Joaquin County
University of New Mexico - School of Architecture & Planning
HUD's Office of Policy Development and Research
HUD's Office of Policy Development and Research
Chaddick Institute at DePaul University
Park City Municipal Corporation
National Capital Planning Commission
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