Equity evaluation of sustainable mileage-based user fee scenarios.
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2013-10-01
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Abstract:The Texas state gas tax has been 20 cents per gallon since 1991, and the federal gas tax has been
18.4 cents per gallon since 1993. The gas tax is not only stagnant, but depreciating in value due to
inflation. This is forcing some transportation providers to increase their focus on spending for a more
sustainable transportation system, thus shifting how tax revenues are spent. One proposed alternative to
the gas tax is the creation of a mileage-based user fee (MBUF), which would then shift how revenues are
collected. This research examined potential equity impacts of these shifts in the collection and
disbursement of transportation funds.
This research used 2009 National Household Travel Survey (NHTS) Texas data along with detailed
spending estimates from the Texas Department of Transportation to consider the equity impacts
surrounding three MBUF and spending scenarios. NHTS data were weighted to reflect results
representative of Texas vehicle-owning households. Each scenario was run both statically and
dynamically under the assumption that the MBUF would replace the state gas tax. Results indicate that
the impact of the MBUF on geographic equity can be different depending on allocation of transportation
funding. However, the MBUF was essentially as equally vertically equitable as the current state gas tax.
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