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Politicians have a love-hate relationship with the gas tax. On the one hand, it’s a simple way to provide funds for roads and bridges — paid for by drivers. On the other hand, the per-gallon tax often fails to keep up with inflation, and lawmakers are loath to raise it.

http://www.washingtonpost.com/blogs/wonkblog/wp/2013/02/25/virginia-has-a-novel-plan-to-replace-the-gas-tax-but-theres-one-big-flaw/